<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:aeee66ea-4e71-4d96-abf3-3863203269fa,g:88ac9073-307c-4311-b7a2-0015d46fc69d-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.soundhound.com/role/Cover" xlink:type="simple" xlink:href="soun-20250930.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_64e8737d-38ae-4244-acc5-b9530fe2e5b6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_DocumentInformationTable_64e8737d-38ae-4244-acc5-b9530fe2e5b6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_74b17b85-1536-4c8c-b46a-36cd21380e2d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_64e8737d-38ae-4244-acc5-b9530fe2e5b6" xlink:to="loc_us-gaap_StatementClassOfStockAxis_74b17b85-1536-4c8c-b46a-36cd21380e2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_74b17b85-1536-4c8c-b46a-36cd21380e2d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_74b17b85-1536-4c8c-b46a-36cd21380e2d" xlink:to="loc_us-gaap_ClassOfStockDomain_74b17b85-1536-4c8c-b46a-36cd21380e2d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_f6ed8dd8-60f7-494b-b8da-58ab7adf641a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_74b17b85-1536-4c8c-b46a-36cd21380e2d" xlink:to="loc_us-gaap_ClassOfStockDomain_f6ed8dd8-60f7-494b-b8da-58ab7adf641a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_cabf8a64-7b7a-4e47-8c58-101d541f91ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_f6ed8dd8-60f7-494b-b8da-58ab7adf641a" xlink:to="loc_us-gaap_CommonClassAMember_cabf8a64-7b7a-4e47-8c58-101d541f91ca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_672df042-a396-4b20-953f-e75a5f7e04a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WarrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_f6ed8dd8-60f7-494b-b8da-58ab7adf641a" xlink:to="loc_us-gaap_WarrantMember_672df042-a396-4b20-953f-e75a5f7e04a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_12e69e80-572e-4122-ad6d-81b45c7deec6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_f6ed8dd8-60f7-494b-b8da-58ab7adf641a" xlink:to="loc_us-gaap_CommonClassBMember_12e69e80-572e-4122-ad6d-81b45c7deec6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_d28c0dbb-f1f9-4dae-b2ce-6b9a2af03eef" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_DocumentType_d28c0dbb-f1f9-4dae-b2ce-6b9a2af03eef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_c637d531-05c7-4d51-aa0a-2cffcc3e6440" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_DocumentQuarterlyReport_c637d531-05c7-4d51-aa0a-2cffcc3e6440" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_0f49ece2-9ffe-43ae-be4c-2858da03c172" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_DocumentPeriodEndDate_0f49ece2-9ffe-43ae-be4c-2858da03c172" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_d18046d3-d20f-4d80-950a-7850df8aee51" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_DocumentTransitionReport_d18046d3-d20f-4d80-950a-7850df8aee51" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_f6c439cf-a602-4726-8b43-cb1ed83d95b9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_EntityFileNumber_f6c439cf-a602-4726-8b43-cb1ed83d95b9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_e57b3d60-058e-450f-94f7-d077f04c39ac" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_EntityRegistrantName_e57b3d60-058e-450f-94f7-d077f04c39ac" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_dee81b0f-c287-439f-94b6-cdb53e389690" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_EntityIncorporationStateCountryCode_dee81b0f-c287-439f-94b6-cdb53e389690" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_47c489e2-6102-415a-89e0-6194175bd362" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_EntityTaxIdentificationNumber_47c489e2-6102-415a-89e0-6194175bd362" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_8152ea8a-a9e5-4ffc-9b0c-c4aa65fb5304" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_EntityAddressAddressLine1_8152ea8a-a9e5-4ffc-9b0c-c4aa65fb5304" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_c38130b0-cc2a-48f4-9d02-dd256107b500" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_EntityAddressCityOrTown_c38130b0-cc2a-48f4-9d02-dd256107b500" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_80e974b3-f07f-495f-a04e-5b630ca87870" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_EntityAddressStateOrProvince_80e974b3-f07f-495f-a04e-5b630ca87870" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_d7b768d5-e4ac-4eb3-aee5-d0fa27cca389" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_EntityAddressPostalZipCode_d7b768d5-e4ac-4eb3-aee5-d0fa27cca389" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_b988e8be-803b-4799-b4de-0ca33982047a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_CityAreaCode_b988e8be-803b-4799-b4de-0ca33982047a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_84a01d57-737f-4b97-b598-5825772d8147" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_LocalPhoneNumber_84a01d57-737f-4b97-b598-5825772d8147" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_083fafcd-7cf5-4498-8ea6-6a09820206dd" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_Security12bTitle_083fafcd-7cf5-4498-8ea6-6a09820206dd" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_1bed010f-dfc2-4d54-9284-bca50f0218b4" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_TradingSymbol_1bed010f-dfc2-4d54-9284-bca50f0218b4" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_2aa40c15-0952-45ad-ac3d-130dc87ba2cd" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_SecurityExchangeName_2aa40c15-0952-45ad-ac3d-130dc87ba2cd" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_d3aa2cfe-5469-4eac-9a7e-fc52bd638e30" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_EntityCurrentReportingStatus_d3aa2cfe-5469-4eac-9a7e-fc52bd638e30" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_bcfa0f95-9724-403b-b866-9f8606360394" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_EntityInteractiveDataCurrent_bcfa0f95-9724-403b-b866-9f8606360394" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_30e8be01-bdfb-4b39-b76a-d08c21733e91" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_EntityFilerCategory_30e8be01-bdfb-4b39-b76a-d08c21733e91" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_40cb113e-99ab-46e7-8441-804a9388ba3f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_EntitySmallBusiness_40cb113e-99ab-46e7-8441-804a9388ba3f" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_268e0815-25c1-4c27-97d7-33a7abc742e0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_EntityEmergingGrowthCompany_268e0815-25c1-4c27-97d7-33a7abc742e0" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_c00973fb-e4de-403e-b329-6b20c51a293d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_EntityShellCompany_c00973fb-e4de-403e-b329-6b20c51a293d" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_ab9644a2-e359-41c0-b719-409765648b58" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_ab9644a2-e359-41c0-b719-409765648b58" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_b75589f7-0f50-49b5-9f9f-8e6c44f9f097" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_EntityCentralIndexKey_b75589f7-0f50-49b5-9f9f-8e6c44f9f097" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_dd52014d-b415-403c-ba72-f02bdee61cc3" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_DocumentFiscalPeriodFocus_dd52014d-b415-403c-ba72-f02bdee61cc3" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_64235c49-4717-403b-bbbf-452709467d69" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_DocumentFiscalYearFocus_64235c49-4717-403b-bbbf-452709467d69" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_a1070168-b3b8-4b2a-8de6-b493d83f0cd1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_AmendmentFlag_a1070168-b3b8-4b2a-8de6-b493d83f0cd1" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_cb6dc8fd-2657-445c-9ab1-44bd40b58456" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_20799ee3-bb33-4b81-98b9-6ad2c8b1a960" xlink:to="loc_dei_CurrentFiscalYearEndDate_cb6dc8fd-2657-445c-9ab1-44bd40b58456" xlink:type="arc" order="28"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="soun-20250930.xsd#CONDENSEDCONSOLIDATEDBALANCESHEETS"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_6654f719-ed27-42e7-ad50-b6d2a6a3e02d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_bcbfbaae-ae45-48d7-b939-0ea8f7d646ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_6654f719-ed27-42e7-ad50-b6d2a6a3e02d" xlink:to="loc_us-gaap_StatementTable_bcbfbaae-ae45-48d7-b939-0ea8f7d646ea" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_1b093786-8a1d-462a-9a8a-ad6d67ac0cb7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_bcbfbaae-ae45-48d7-b939-0ea8f7d646ea" xlink:to="loc_us-gaap_StatementClassOfStockAxis_1b093786-8a1d-462a-9a8a-ad6d67ac0cb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_1b093786-8a1d-462a-9a8a-ad6d67ac0cb7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1b093786-8a1d-462a-9a8a-ad6d67ac0cb7" xlink:to="loc_us-gaap_ClassOfStockDomain_1b093786-8a1d-462a-9a8a-ad6d67ac0cb7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_1f6f75bb-f89c-4cfa-9029-e7a3fafd702c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_1b093786-8a1d-462a-9a8a-ad6d67ac0cb7" xlink:to="loc_us-gaap_ClassOfStockDomain_1f6f75bb-f89c-4cfa-9029-e7a3fafd702c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_f05f3f6d-d0fc-4464-8d86-a54353bc5abf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_1f6f75bb-f89c-4cfa-9029-e7a3fafd702c" xlink:to="loc_us-gaap_CommonClassAMember_f05f3f6d-d0fc-4464-8d86-a54353bc5abf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_ded31ec1-c49a-475b-a980-d12cbec530ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_1f6f75bb-f89c-4cfa-9029-e7a3fafd702c" xlink:to="loc_us-gaap_CommonClassBMember_ded31ec1-c49a-475b-a980-d12cbec530ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_fde34960-0a13-45d9-8a40-f91dad0f0d60" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_6654f719-ed27-42e7-ad50-b6d2a6a3e02d" xlink:to="loc_us-gaap_AssetsAbstract_fde34960-0a13-45d9-8a40-f91dad0f0d60" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrentAbstract_423fff50-0182-40e8-97c4-667b51f14667" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_fde34960-0a13-45d9-8a40-f91dad0f0d60" xlink:to="loc_us-gaap_AssetsCurrentAbstract_423fff50-0182-40e8-97c4-667b51f14667" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_878af325-e3b1-486d-8dc6-c59ac1c660ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_423fff50-0182-40e8-97c4-667b51f14667" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_878af325-e3b1-486d-8dc6-c59ac1c660ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNet_4da5c74f-2438-4892-8c06-249cbec02d67" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_423fff50-0182-40e8-97c4-667b51f14667" xlink:to="loc_us-gaap_AccountsReceivableNet_4da5c74f-2438-4892-8c06-249cbec02d67" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContractWithCustomerAssetAfterAllowanceForCreditLossIncludingUnbilledReceivablesCurrent_fe27d0c0-c7fe-426e-8de6-b1ced274367d" xlink:href="soun-20250930.xsd#soun_ContractWithCustomerAssetAfterAllowanceForCreditLossIncludingUnbilledReceivablesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_423fff50-0182-40e8-97c4-667b51f14667" xlink:to="loc_soun_ContractWithCustomerAssetAfterAllowanceForCreditLossIncludingUnbilledReceivablesCurrent_fe27d0c0-c7fe-426e-8de6-b1ced274367d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_15bc4c8e-bf38-4839-80bb-eb49984e6953" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_423fff50-0182-40e8-97c4-667b51f14667" xlink:to="loc_us-gaap_OtherAssetsCurrent_15bc4c8e-bf38-4839-80bb-eb49984e6953" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_1a6b1083-a427-4fa9-8106-ea531b23adfb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_423fff50-0182-40e8-97c4-667b51f14667" xlink:to="loc_us-gaap_AssetsCurrent_1a6b1083-a427-4fa9-8106-ea531b23adfb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsNoncurrent_2bff541f-dbd6-410e-924d-e992a7259254" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_fde34960-0a13-45d9-8a40-f91dad0f0d60" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsNoncurrent_2bff541f-dbd6-410e-924d-e992a7259254" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_ab7c8886-0e2e-4e35-a6dd-09413dfbca43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_fde34960-0a13-45d9-8a40-f91dad0f0d60" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_ab7c8886-0e2e-4e35-a6dd-09413dfbca43" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_39e3597f-214c-46bc-9fde-f0d2af110a8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_fde34960-0a13-45d9-8a40-f91dad0f0d60" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_39e3597f-214c-46bc-9fde-f0d2af110a8c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_8eaa208e-dd99-4735-92ba-63aca01c5af7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_fde34960-0a13-45d9-8a40-f91dad0f0d60" xlink:to="loc_us-gaap_Goodwill_8eaa208e-dd99-4735-92ba-63aca01c5af7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_5b770131-efd9-4115-b099-b5e75bed6255" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_fde34960-0a13-45d9-8a40-f91dad0f0d60" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_5b770131-efd9-4115-b099-b5e75bed6255" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_b60d1c1f-a2cc-42bf-8585-5fd8d8876b72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_fde34960-0a13-45d9-8a40-f91dad0f0d60" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_b60d1c1f-a2cc-42bf-8585-5fd8d8876b72" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetNoncurrent_ec4db601-b233-4622-8c8a-18b8b4bec8b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerAssetNetNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_fde34960-0a13-45d9-8a40-f91dad0f0d60" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetNoncurrent_ec4db601-b233-4622-8c8a-18b8b4bec8b5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_17aba607-1f08-49f8-812a-7ccd4e63b0ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_fde34960-0a13-45d9-8a40-f91dad0f0d60" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_17aba607-1f08-49f8-812a-7ccd4e63b0ba" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_f03df474-8126-4a1a-a1df-3f42908c3581" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_fde34960-0a13-45d9-8a40-f91dad0f0d60" xlink:to="loc_us-gaap_Assets_f03df474-8126-4a1a-a1df-3f42908c3581" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_462d36d8-9b95-4b5f-af2e-f5fa7df660c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_6654f719-ed27-42e7-ad50-b6d2a6a3e02d" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_462d36d8-9b95-4b5f-af2e-f5fa7df660c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_d4ddf7a9-00a0-488f-9e16-aa6c33e874b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_462d36d8-9b95-4b5f-af2e-f5fa7df660c3" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_d4ddf7a9-00a0-488f-9e16-aa6c33e874b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_f671b8b9-4501-44a4-8931-0f6b1d210d43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_d4ddf7a9-00a0-488f-9e16-aa6c33e874b7" xlink:to="loc_us-gaap_AccountsPayableCurrent_f671b8b9-4501-44a4-8931-0f6b1d210d43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_c4c048ab-7312-435c-a12d-384a5e8b1b7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_d4ddf7a9-00a0-488f-9e16-aa6c33e874b7" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_c4c048ab-7312-435c-a12d-384a5e8b1b7c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_8f29cb0e-b7d8-417f-9140-c09ed11562ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_d4ddf7a9-00a0-488f-9e16-aa6c33e874b7" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_8f29cb0e-b7d8-417f-9140-c09ed11562ba" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_d8952ae6-8649-4e58-9946-6193e49d02d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_d4ddf7a9-00a0-488f-9e16-aa6c33e874b7" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent_d8952ae6-8649-4e58-9946-6193e49d02d5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxesPayableCurrent_e60d2572-361a-46ad-a657-1182aa9656da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TaxesPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_d4ddf7a9-00a0-488f-9e16-aa6c33e874b7" xlink:to="loc_us-gaap_TaxesPayableCurrent_e60d2572-361a-46ad-a657-1182aa9656da" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_68c58fa1-020b-4f1e-9dd4-cdd2540e5712" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_d4ddf7a9-00a0-488f-9e16-aa6c33e874b7" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_68c58fa1-020b-4f1e-9dd4-cdd2540e5712" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_93700168-f22a-43ae-94f1-a76953d8acbb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_d4ddf7a9-00a0-488f-9e16-aa6c33e874b7" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_93700168-f22a-43ae-94f1-a76953d8acbb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_bc7e2a32-f387-40df-959a-82c3b133bca4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_d4ddf7a9-00a0-488f-9e16-aa6c33e874b7" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_bc7e2a32-f387-40df-959a-82c3b133bca4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_6202b59b-f387-43c4-8a63-2f2e95db3589" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_d4ddf7a9-00a0-488f-9e16-aa6c33e874b7" xlink:to="loc_us-gaap_LiabilitiesCurrent_6202b59b-f387-43c4-8a63-2f2e95db3589" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_3dae0421-8aae-48d0-a213-4768a2bf77d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_462d36d8-9b95-4b5f-af2e-f5fa7df660c3" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_3dae0421-8aae-48d0-a213-4768a2bf77d9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_5f8f72ae-8f62-4e85-baf7-e17f44750b72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_462d36d8-9b95-4b5f-af2e-f5fa7df660c3" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_5f8f72ae-8f62-4e85-baf7-e17f44750b72" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_5b4ac01b-dcd8-41d6-99f6-23aafcd7444e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_462d36d8-9b95-4b5f-af2e-f5fa7df660c3" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_5b4ac01b-dcd8-41d6-99f6-23aafcd7444e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedIncomeTaxesNoncurrent_f8163ea6-98c4-4019-9a0a-133beab8cd52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccruedIncomeTaxesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_462d36d8-9b95-4b5f-af2e-f5fa7df660c3" xlink:to="loc_us-gaap_AccruedIncomeTaxesNoncurrent_f8163ea6-98c4-4019-9a0a-133beab8cd52" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_90822fa4-555a-4ec1-b9cc-c8d2a1f17d27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_462d36d8-9b95-4b5f-af2e-f5fa7df660c3" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_90822fa4-555a-4ec1-b9cc-c8d2a1f17d27" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_060f1053-ddca-43ac-8112-202a19242b29" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_462d36d8-9b95-4b5f-af2e-f5fa7df660c3" xlink:to="loc_us-gaap_Liabilities_060f1053-ddca-43ac-8112-202a19242b29" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_5ec43519-d463-4ab5-a977-c30ea8a0e961" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_462d36d8-9b95-4b5f-af2e-f5fa7df660c3" xlink:to="loc_us-gaap_CommitmentsAndContingencies_5ec43519-d463-4ab5-a977-c30ea8a0e961" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_af4678ba-22dc-48d3-bb19-bfe24cee2524" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_462d36d8-9b95-4b5f-af2e-f5fa7df660c3" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_af4678ba-22dc-48d3-bb19-bfe24cee2524" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_9d99c27d-aa01-4d17-8f1f-101bac875700" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_af4678ba-22dc-48d3-bb19-bfe24cee2524" xlink:to="loc_us-gaap_PreferredStockValue_9d99c27d-aa01-4d17-8f1f-101bac875700" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_15f841a9-b5bf-46e1-9fe0-fb662227a4b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_af4678ba-22dc-48d3-bb19-bfe24cee2524" xlink:to="loc_us-gaap_CommonStockValue_15f841a9-b5bf-46e1-9fe0-fb662227a4b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_03b0c075-866d-4c39-bb48-ca3672abcf5a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_af4678ba-22dc-48d3-bb19-bfe24cee2524" xlink:to="loc_us-gaap_AdditionalPaidInCapital_03b0c075-866d-4c39-bb48-ca3672abcf5a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_2d814bc6-b066-4d2a-914f-4891a32ec7ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_af4678ba-22dc-48d3-bb19-bfe24cee2524" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_2d814bc6-b066-4d2a-914f-4891a32ec7ee" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_2badba9e-2163-4e6d-9459-e7c6551f8cfc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_af4678ba-22dc-48d3-bb19-bfe24cee2524" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_2badba9e-2163-4e6d-9459-e7c6551f8cfc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_40f2f60d-611c-4af1-a2b7-a7093fb3b1e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_af4678ba-22dc-48d3-bb19-bfe24cee2524" xlink:to="loc_us-gaap_StockholdersEquity_40f2f60d-611c-4af1-a2b7-a7093fb3b1e9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_ce01c89e-c41e-44b7-9625-e01ed60d57ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_462d36d8-9b95-4b5f-af2e-f5fa7df660c3" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_ce01c89e-c41e-44b7-9625-e01ed60d57ad" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSParentheticals" xlink:type="simple" xlink:href="soun-20250930.xsd#CONDENSEDCONSOLIDATEDBALANCESHEETSParentheticals"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSParentheticals" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_913e63c0-e262-412a-90af-3d46f7b4a89b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_19e55096-9da7-4eba-b1a1-88b1b394afc0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_913e63c0-e262-412a-90af-3d46f7b4a89b" xlink:to="loc_us-gaap_StatementTable_19e55096-9da7-4eba-b1a1-88b1b394afc0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_34978271-fb56-45e6-b618-acfc0bfecc37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_19e55096-9da7-4eba-b1a1-88b1b394afc0" xlink:to="loc_us-gaap_StatementClassOfStockAxis_34978271-fb56-45e6-b618-acfc0bfecc37" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_34978271-fb56-45e6-b618-acfc0bfecc37_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_34978271-fb56-45e6-b618-acfc0bfecc37" xlink:to="loc_us-gaap_ClassOfStockDomain_34978271-fb56-45e6-b618-acfc0bfecc37_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_5c551cee-6c3c-46a9-bd10-15cd254f5a5a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_34978271-fb56-45e6-b618-acfc0bfecc37" xlink:to="loc_us-gaap_ClassOfStockDomain_5c551cee-6c3c-46a9-bd10-15cd254f5a5a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_bb0376b0-5dc7-4c69-b099-af6269e63758" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_5c551cee-6c3c-46a9-bd10-15cd254f5a5a" xlink:to="loc_us-gaap_CommonClassAMember_bb0376b0-5dc7-4c69-b099-af6269e63758" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_4f906473-07da-4204-b34d-7c4694644afd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_5c551cee-6c3c-46a9-bd10-15cd254f5a5a" xlink:to="loc_us-gaap_CommonClassBMember_4f906473-07da-4204-b34d-7c4694644afd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_9c9b3503-4409-49a3-a2dc-54523ce21d84" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_913e63c0-e262-412a-90af-3d46f7b4a89b" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_9c9b3503-4409-49a3-a2dc-54523ce21d84" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_b87163f9-ae96-4535-b10f-653b56cad918" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_913e63c0-e262-412a-90af-3d46f7b4a89b" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_b87163f9-ae96-4535-b10f-653b56cad918" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_ce10f8bb-65a2-4910-be36-155332975987" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_913e63c0-e262-412a-90af-3d46f7b4a89b" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_ce10f8bb-65a2-4910-be36-155332975987" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_36677280-98cc-474c-97b0-d80a41bb26e0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_913e63c0-e262-412a-90af-3d46f7b4a89b" xlink:to="loc_us-gaap_PreferredStockSharesIssued_36677280-98cc-474c-97b0-d80a41bb26e0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_a22a64d7-751b-49fa-b37d-98afec5660b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_913e63c0-e262-412a-90af-3d46f7b4a89b" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_a22a64d7-751b-49fa-b37d-98afec5660b4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockLiquidationPreferenceValue_b10d5426-0dfc-4bdf-8a73-996f775c2533" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockLiquidationPreferenceValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_913e63c0-e262-412a-90af-3d46f7b4a89b" xlink:to="loc_us-gaap_PreferredStockLiquidationPreferenceValue_b10d5426-0dfc-4bdf-8a73-996f775c2533" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_af07911f-7514-4a0a-8ecf-ae0e1bc1b43a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_913e63c0-e262-412a-90af-3d46f7b4a89b" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_af07911f-7514-4a0a-8ecf-ae0e1bc1b43a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_85d08496-8f09-4911-b00c-24a96bac2c9e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_913e63c0-e262-412a-90af-3d46f7b4a89b" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_85d08496-8f09-4911-b00c-24a96bac2c9e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_8e1bd439-85f2-404e-aa9c-a5176af86a2c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_913e63c0-e262-412a-90af-3d46f7b4a89b" xlink:to="loc_us-gaap_CommonStockSharesIssued_8e1bd439-85f2-404e-aa9c-a5176af86a2c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_494ab99c-83d3-4b2e-807d-e53eef89958b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_913e63c0-e262-412a-90af-3d46f7b4a89b" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_494ab99c-83d3-4b2e-807d-e53eef89958b" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="simple" xlink:href="soun-20250930.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_bf1fca0d-72e5-4571-8881-48a0a84b121a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_4b6679db-ff94-4d8e-97b6-0984069b70b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_bf1fca0d-72e5-4571-8881-48a0a84b121a" xlink:to="loc_us-gaap_StatementTable_4b6679db-ff94-4d8e-97b6-0984069b70b4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_ae2585b5-962e-425a-8f5f-150ce70abf41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4b6679db-ff94-4d8e-97b6-0984069b70b4" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_ae2585b5-962e-425a-8f5f-150ce70abf41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_ae2585b5-962e-425a-8f5f-150ce70abf41_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_ae2585b5-962e-425a-8f5f-150ce70abf41" xlink:to="loc_us-gaap_EquityComponentDomain_ae2585b5-962e-425a-8f5f-150ce70abf41_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_e4170200-3aa0-42e8-b71e-e77e448e532c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_ae2585b5-962e-425a-8f5f-150ce70abf41" xlink:to="loc_us-gaap_EquityComponentDomain_e4170200-3aa0-42e8-b71e-e77e448e532c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_f8d5d421-e153-44a1-84cb-c96c22e527e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_e4170200-3aa0-42e8-b71e-e77e448e532c" xlink:to="loc_us-gaap_PreferredStockMember_f8d5d421-e153-44a1-84cb-c96c22e527e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_52b4ae18-e918-4922-9e5e-c234ca686261" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_e4170200-3aa0-42e8-b71e-e77e448e532c" xlink:to="loc_us-gaap_CommonStockMember_52b4ae18-e918-4922-9e5e-c234ca686261" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_811cd8aa-a5bb-4b4b-867a-2082b6d33412" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_e4170200-3aa0-42e8-b71e-e77e448e532c" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_811cd8aa-a5bb-4b4b-867a-2082b6d33412" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_0adeeb2a-fd3e-4a34-95a9-d724c45205ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_e4170200-3aa0-42e8-b71e-e77e448e532c" xlink:to="loc_us-gaap_RetainedEarningsMember_0adeeb2a-fd3e-4a34-95a9-d724c45205ea" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_3f7667a7-55c4-4dfa-9dbe-2273d4525c60" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_e4170200-3aa0-42e8-b71e-e77e448e532c" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_3f7667a7-55c4-4dfa-9dbe-2273d4525c60" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_7cddc6f8-b7a3-4200-b6c6-7eb48c2db4b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4b6679db-ff94-4d8e-97b6-0984069b70b4" xlink:to="loc_us-gaap_StatementClassOfStockAxis_7cddc6f8-b7a3-4200-b6c6-7eb48c2db4b4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_7cddc6f8-b7a3-4200-b6c6-7eb48c2db4b4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_7cddc6f8-b7a3-4200-b6c6-7eb48c2db4b4" xlink:to="loc_us-gaap_ClassOfStockDomain_7cddc6f8-b7a3-4200-b6c6-7eb48c2db4b4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_714c0f8c-f64c-4d68-946a-ff00fce67695" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_7cddc6f8-b7a3-4200-b6c6-7eb48c2db4b4" xlink:to="loc_us-gaap_ClassOfStockDomain_714c0f8c-f64c-4d68-946a-ff00fce67695" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_3a209151-fa51-411f-bf89-841af1248677" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_714c0f8c-f64c-4d68-946a-ff00fce67695" xlink:to="loc_us-gaap_CommonClassAMember_3a209151-fa51-411f-bf89-841af1248677" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_5ad5390e-3517-4686-8b39-83becd1ddfbe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_714c0f8c-f64c-4d68-946a-ff00fce67695" xlink:to="loc_us-gaap_CommonClassBMember_5ad5390e-3517-4686-8b39-83becd1ddfbe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockByUniqueDescriptionAxis_27fb208e-1654-48c6-a3cf-32591ebd9b1a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConversionOfStockByUniqueDescriptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4b6679db-ff94-4d8e-97b6-0984069b70b4" xlink:to="loc_us-gaap_ConversionOfStockByUniqueDescriptionAxis_27fb208e-1654-48c6-a3cf-32591ebd9b1a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockNameDomain_27fb208e-1654-48c6-a3cf-32591ebd9b1a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConversionOfStockNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConversionOfStockByUniqueDescriptionAxis_27fb208e-1654-48c6-a3cf-32591ebd9b1a" xlink:to="loc_us-gaap_ConversionOfStockNameDomain_27fb208e-1654-48c6-a3cf-32591ebd9b1a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockNameDomain_ab5a6c20-d072-446d-8460-19d715fdf6ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConversionOfStockNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConversionOfStockByUniqueDescriptionAxis_27fb208e-1654-48c6-a3cf-32591ebd9b1a" xlink:to="loc_us-gaap_ConversionOfStockNameDomain_ab5a6c20-d072-446d-8460-19d715fdf6ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ConversionUponExerciseOfWarrantsMember_b43ab254-3ceb-4d47-ba59-19e46774eb94" xlink:href="soun-20250930.xsd#soun_ConversionUponExerciseOfWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConversionOfStockNameDomain_ab5a6c20-d072-446d-8460-19d715fdf6ee" xlink:to="loc_soun_ConversionUponExerciseOfWarrantsMember_b43ab254-3ceb-4d47-ba59-19e46774eb94" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ConversionOfClassBCommonStockMember_330c91dc-ebac-4658-8d3e-877623b3b185" xlink:href="soun-20250930.xsd#soun_ConversionOfClassBCommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConversionOfStockNameDomain_ab5a6c20-d072-446d-8460-19d715fdf6ee" xlink:to="loc_soun_ConversionOfClassBCommonStockMember_330c91dc-ebac-4658-8d3e-877623b3b185" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ConversionOfConvertiblePreferredStockMember_21d22a98-fd56-41ad-99f5-88b40a96b883" xlink:href="soun-20250930.xsd#soun_ConversionOfConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConversionOfStockNameDomain_ab5a6c20-d072-446d-8460-19d715fdf6ee" xlink:to="loc_soun_ConversionOfConvertiblePreferredStockMember_21d22a98-fd56-41ad-99f5-88b40a96b883" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_40c2ed97-128e-4b43-bb92-fb43bfd84232" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4b6679db-ff94-4d8e-97b6-0984069b70b4" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_40c2ed97-128e-4b43-bb92-fb43bfd84232" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_40c2ed97-128e-4b43-bb92-fb43bfd84232_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_40c2ed97-128e-4b43-bb92-fb43bfd84232" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_40c2ed97-128e-4b43-bb92-fb43bfd84232_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a3812511-f822-4480-ad20-73d8d2e5d7d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_40c2ed97-128e-4b43-bb92-fb43bfd84232" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a3812511-f822-4480-ad20-73d8d2e5d7d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_Synq3IncMember_95eedf51-fbed-4b42-8c89-ff4612da9427" xlink:href="soun-20250930.xsd#soun_Synq3IncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a3812511-f822-4480-ad20-73d8d2e5d7d6" xlink:to="loc_soun_Synq3IncMember_95eedf51-fbed-4b42-8c89-ff4612da9427" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_AmeliaTechnologiesLLCMember_2c748b6b-6e56-4290-aa84-c97e11d33d48" xlink:href="soun-20250930.xsd#soun_AmeliaTechnologiesLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a3812511-f822-4480-ad20-73d8d2e5d7d6" xlink:to="loc_soun_AmeliaTechnologiesLLCMember_2c748b6b-6e56-4290-aa84-c97e11d33d48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_a06f9943-98da-4fb8-9234-d429e9ebd865" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_bf1fca0d-72e5-4571-8881-48a0a84b121a" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_a06f9943-98da-4fb8-9234-d429e9ebd865" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_0acec8f9-7035-4dce-a5f0-be6c855e4ab3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_a06f9943-98da-4fb8-9234-d429e9ebd865" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_0acec8f9-7035-4dce-a5f0-be6c855e4ab3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_2a481fc8-768d-4036-942e-64fcf3115092" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_a06f9943-98da-4fb8-9234-d429e9ebd865" xlink:to="loc_us-gaap_StockholdersEquity_2a481fc8-768d-4036-942e-64fcf3115092" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_07fba4b3-604f-4ee7-87bc-60e1d34d8c81" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_a06f9943-98da-4fb8-9234-d429e9ebd865" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_07fba4b3-604f-4ee7-87bc-60e1d34d8c81" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_c68ac90e-4c6a-4e49-a921-ef2b3136783f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_a06f9943-98da-4fb8-9234-d429e9ebd865" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_c68ac90e-4c6a-4e49-a921-ef2b3136783f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_5cf172f3-ac80-4313-890b-b7346f8fc28a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_a06f9943-98da-4fb8-9234-d429e9ebd865" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_5cf172f3-ac80-4313-890b-b7346f8fc28a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_3ded83f1-1119-485a-9754-1c255dc7be4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_a06f9943-98da-4fb8-9234-d429e9ebd865" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_3ded83f1-1119-485a-9754-1c255dc7be4e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_d8510277-8ba7-4f1c-a4fa-e90aa6754222" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_a06f9943-98da-4fb8-9234-d429e9ebd865" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_d8510277-8ba7-4f1c-a4fa-e90aa6754222" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_60551294-599e-493d-bee3-f55cb3df42b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_a06f9943-98da-4fb8-9234-d429e9ebd865" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_60551294-599e-493d-bee3-f55cb3df42b1" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_5f884376-f293-42bc-9389-9372dd41d6cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_a06f9943-98da-4fb8-9234-d429e9ebd865" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_5f884376-f293-42bc-9389-9372dd41d6cd" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_9da1582d-c630-4fa2-a753-0f03a55dbfc2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_a06f9943-98da-4fb8-9234-d429e9ebd865" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_9da1582d-c630-4fa2-a753-0f03a55dbfc2" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_e1840a7c-056f-4797-8758-161f5151c9b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_a06f9943-98da-4fb8-9234-d429e9ebd865" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_e1840a7c-056f-4797-8758-161f5151c9b2" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_03d8620e-60c9-4fa3-8e15-4e1a633a00e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_a06f9943-98da-4fb8-9234-d429e9ebd865" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_03d8620e-60c9-4fa3-8e15-4e1a633a00e2" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_StockIssuedDuringPeriodSharesNetExerciseOfOutstandingWarrantsShares_2f2adb30-1ff5-4be3-bfb1-cff212c84678" xlink:href="soun-20250930.xsd#soun_StockIssuedDuringPeriodSharesNetExerciseOfOutstandingWarrantsShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_a06f9943-98da-4fb8-9234-d429e9ebd865" xlink:to="loc_soun_StockIssuedDuringPeriodSharesNetExerciseOfOutstandingWarrantsShares_2f2adb30-1ff5-4be3-bfb1-cff212c84678" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_StockIssuedDuringPeriodSharesObligationUnderAmendedTermLoanFacility_f19710c4-1a28-47b3-992c-2578fe2d585a" xlink:href="soun-20250930.xsd#soun_StockIssuedDuringPeriodSharesObligationUnderAmendedTermLoanFacility"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_a06f9943-98da-4fb8-9234-d429e9ebd865" xlink:to="loc_soun_StockIssuedDuringPeriodSharesObligationUnderAmendedTermLoanFacility_f19710c4-1a28-47b3-992c-2578fe2d585a" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_StockIssuedDuringPeriodValueObligationUnderAmendedTermLoanFacility_99c7f20a-20bd-4dae-ad8c-dd60e16d04c9" xlink:href="soun-20250930.xsd#soun_StockIssuedDuringPeriodValueObligationUnderAmendedTermLoanFacility"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_a06f9943-98da-4fb8-9234-d429e9ebd865" xlink:to="loc_soun_StockIssuedDuringPeriodValueObligationUnderAmendedTermLoanFacility_99c7f20a-20bd-4dae-ad8c-dd60e16d04c9" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_dd8dd3c1-a8f2-4236-b500-c31324140079" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_a06f9943-98da-4fb8-9234-d429e9ebd865" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_dd8dd3c1-a8f2-4236-b500-c31324140079" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_a4974c7f-3b00-46a4-965c-1ccdec5ba21e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_a06f9943-98da-4fb8-9234-d429e9ebd865" xlink:to="loc_us-gaap_NetIncomeLoss_a4974c7f-3b00-46a4-965c-1ccdec5ba21e" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_a9c4abf6-613c-4a0e-8534-68caaf4a14b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_a06f9943-98da-4fb8-9234-d429e9ebd865" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_a9c4abf6-613c-4a0e-8534-68caaf4a14b5" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_bca279ee-403f-47c3-818a-729fdb455dc9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_273350b8-072b-46d4-be8d-17295b9300a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_71d38ec0-2007-4a54-8c6b-bff52afaac31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="soun-20250930.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncashOrPartNoncashAcquisitionsLineItems_df88ec2c-0061-4574-a2e5-5d2c3472d8f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncashOrPartNoncashAcquisitionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncashOrPartNoncashAcquisitionsTable_bb729447-11fc-4930-92bd-a363496651be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncashOrPartNoncashAcquisitionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionsLineItems_df88ec2c-0061-4574-a2e5-5d2c3472d8f1" xlink:to="loc_us-gaap_NoncashOrPartNoncashAcquisitionsTable_bb729447-11fc-4930-92bd-a363496651be" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis_07c32397-c779-4170-b06d-078f5cad9c4c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionsTable_bb729447-11fc-4930-92bd-a363496651be" xlink:to="loc_us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis_07c32397-c779-4170-b06d-078f5cad9c4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSignificantNoncashTransactionNameDomain_07c32397-c779-4170-b06d-078f5cad9c4c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherSignificantNoncashTransactionNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis_07c32397-c779-4170-b06d-078f5cad9c4c" xlink:to="loc_us-gaap_OtherSignificantNoncashTransactionNameDomain_07c32397-c779-4170-b06d-078f5cad9c4c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSignificantNoncashTransactionNameDomain_7c5fd637-0a1b-43f6-a16d-75932544377c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherSignificantNoncashTransactionNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis_07c32397-c779-4170-b06d-078f5cad9c4c" xlink:to="loc_us-gaap_OtherSignificantNoncashTransactionNameDomain_7c5fd637-0a1b-43f6-a16d-75932544377c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SettleObligationsUnderAmeliaDebtMember_69ddb8d7-09a0-40a7-b4b7-a07400149bf7" xlink:href="soun-20250930.xsd#soun_SettleObligationsUnderAmeliaDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionNameDomain_7c5fd637-0a1b-43f6-a16d-75932544377c" xlink:to="loc_soun_SettleObligationsUnderAmeliaDebtMember_69ddb8d7-09a0-40a7-b4b7-a07400149bf7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SettleContigentHoldbackConsiderationOfSYNQ3AcquisitionMemberMember_71601482-652f-4787-900b-938d5073ab2b" xlink:href="soun-20250930.xsd#soun_SettleContigentHoldbackConsiderationOfSYNQ3AcquisitionMemberMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionNameDomain_7c5fd637-0a1b-43f6-a16d-75932544377c" xlink:to="loc_soun_SettleContigentHoldbackConsiderationOfSYNQ3AcquisitionMemberMember_71601482-652f-4787-900b-938d5073ab2b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_96426fad-a7c7-44b4-a486-89a893b276fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionsTable_bb729447-11fc-4930-92bd-a363496651be" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_96426fad-a7c7-44b4-a486-89a893b276fd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_96426fad-a7c7-44b4-a486-89a893b276fd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_96426fad-a7c7-44b4-a486-89a893b276fd" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_96426fad-a7c7-44b4-a486-89a893b276fd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b64a13a6-b9b7-41c1-a926-87f474d9aa1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_96426fad-a7c7-44b4-a486-89a893b276fd" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b64a13a6-b9b7-41c1-a926-87f474d9aa1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_Synq3IncMember_6d496f24-f1f5-4f4d-b34f-fe4384d617e2" xlink:href="soun-20250930.xsd#soun_Synq3IncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b64a13a6-b9b7-41c1-a926-87f474d9aa1c" xlink:to="loc_soun_Synq3IncMember_6d496f24-f1f5-4f4d-b34f-fe4384d617e2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_OtherAcquisitionMember_aaad06fd-211a-4310-89ce-0b4cf034cbaf" xlink:href="soun-20250930.xsd#soun_OtherAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b64a13a6-b9b7-41c1-a926-87f474d9aa1c" xlink:to="loc_soun_OtherAcquisitionMember_aaad06fd-211a-4310-89ce-0b4cf034cbaf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_InteractionsAcquisitionMember_b2d72a7c-7516-434f-8bf6-4627289462b5" xlink:href="soun-20250930.xsd#soun_InteractionsAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b64a13a6-b9b7-41c1-a926-87f474d9aa1c" xlink:to="loc_soun_InteractionsAcquisitionMember_b2d72a7c-7516-434f-8bf6-4627289462b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_285708e1-faff-48da-a19e-35d310295e94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionsTable_bb729447-11fc-4930-92bd-a363496651be" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_285708e1-faff-48da-a19e-35d310295e94" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_285708e1-faff-48da-a19e-35d310295e94_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_285708e1-faff-48da-a19e-35d310295e94" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_285708e1-faff-48da-a19e-35d310295e94_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_e913302d-7db5-4b69-af34-e8184ed25bc9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_285708e1-faff-48da-a19e-35d310295e94" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_e913302d-7db5-4b69-af34-e8184ed25bc9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationEarnoutLiabilityMember_c3d3a15d-a421-422d-a327-a9a8931c1ab4" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationEarnoutLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_e913302d-7db5-4b69-af34-e8184ed25bc9" xlink:to="loc_soun_ContingentConsiderationEarnoutLiabilityMember_c3d3a15d-a421-422d-a327-a9a8931c1ab4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationHoldbackLiabilityMember_6891e9ee-15f3-4d01-b7c5-1837fa27dc3a" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationHoldbackLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_e913302d-7db5-4b69-af34-e8184ed25bc9" xlink:to="loc_soun_ContingentConsiderationHoldbackLiabilityMember_6891e9ee-15f3-4d01-b7c5-1837fa27dc3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockAmountConverted1_82468e67-b439-42f4-8a6c-6022b57b93ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConversionOfStockAmountConverted1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionsLineItems_df88ec2c-0061-4574-a2e5-5d2c3472d8f1" xlink:to="loc_us-gaap_ConversionOfStockAmountConverted1_82468e67-b439-42f4-8a6c-6022b57b93ca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssued1_0bebbfd1-12cb-4c9a-9e48-ce96c82bf0e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssued1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionsLineItems_df88ec2c-0061-4574-a2e5-5d2c3472d8f1" xlink:to="loc_us-gaap_StockIssued1_0bebbfd1-12cb-4c9a-9e48-ce96c82bf0e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_DeferredOfferingCostsReclassifiedToAdditionalPaidInCapital_40d39f09-e6b6-4983-a9f0-931dd2e0a3e8" xlink:href="soun-20250930.xsd#soun_DeferredOfferingCostsReclassifiedToAdditionalPaidInCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionsLineItems_df88ec2c-0061-4574-a2e5-5d2c3472d8f1" xlink:to="loc_soun_DeferredOfferingCostsReclassifiedToAdditionalPaidInCapital_40d39f09-e6b6-4983-a9f0-931dd2e0a3e8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1_c1f72134-a57c-4159-bc75-68ff5298d094" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionsLineItems_df88ec2c-0061-4574-a2e5-5d2c3472d8f1" xlink:to="loc_us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1_c1f72134-a57c-4159-bc75-68ff5298d094" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_FairValueOfClassACommonStockIssuedForBusinessCombination_5cf43aa6-475c-4ef0-b96d-de5d182525aa" xlink:href="soun-20250930.xsd#soun_FairValueOfClassACommonStockIssuedForBusinessCombination"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionsLineItems_df88ec2c-0061-4574-a2e5-5d2c3472d8f1" xlink:to="loc_soun_FairValueOfClassACommonStockIssuedForBusinessCombination_5cf43aa6-475c-4ef0-b96d-de5d182525aa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationContingentConsideration_8b334aa5-e047-4d2d-bef8-367f21d2cb07" xlink:href="soun-20250930.xsd#soun_NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationContingentConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionsLineItems_df88ec2c-0061-4574-a2e5-5d2c3472d8f1" xlink:to="loc_soun_NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationContingentConsideration_8b334aa5-e047-4d2d-bef8-367f21d2cb07" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationDeferredCashConsideration_d7564e2c-8992-46a7-86db-797ff2b8795e" xlink:href="soun-20250930.xsd#soun_NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationDeferredCashConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionsLineItems_df88ec2c-0061-4574-a2e5-5d2c3472d8f1" xlink:to="loc_soun_NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationDeferredCashConsideration_d7564e2c-8992-46a7-86db-797ff2b8795e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_StockBasedCompensationIncludedInCapitalizedSoftwareDevelopmentCosts_1ace1113-aebe-470e-b5fe-ff31ec980e63" xlink:href="soun-20250930.xsd#soun_StockBasedCompensationIncludedInCapitalizedSoftwareDevelopmentCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionsLineItems_df88ec2c-0061-4574-a2e5-5d2c3472d8f1" xlink:to="loc_soun_StockBasedCompensationIncludedInCapitalizedSoftwareDevelopmentCosts_1ace1113-aebe-470e-b5fe-ff31ec980e63" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/BASISOFPRESENTATIONANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#BASISOFPRESENTATIONANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/BASISOFPRESENTATIONANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_ea765e77-c492-44b6-9f09-fa29d254c7d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_71e25dc8-5fd2-49a9-a182-0a1cc9ab46fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_ea765e77-c492-44b6-9f09-fa29d254c7d4" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_71e25dc8-5fd2-49a9-a182-0a1cc9ab46fa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_f594481f-493f-49e1-a227-d3c6b5cc1b09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_71e25dc8-5fd2-49a9-a182-0a1cc9ab46fa" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_f594481f-493f-49e1-a227-d3c6b5cc1b09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_f594481f-493f-49e1-a227-d3c6b5cc1b09_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_f594481f-493f-49e1-a227-d3c6b5cc1b09" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_f594481f-493f-49e1-a227-d3c6b5cc1b09_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_83ded6d4-b8f7-4673-a701-15203dbb9ee3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_f594481f-493f-49e1-a227-d3c6b5cc1b09" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_83ded6d4-b8f7-4673-a701-15203dbb9ee3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_27ae68f2-8ade-4f83-bd6a-a615ab9398f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_83ded6d4-b8f7-4673-a701-15203dbb9ee3" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_27ae68f2-8ade-4f83-bd6a-a615ab9398f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_2d2ccabc-54f6-4d8f-b229-22ef33eead21" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_71e25dc8-5fd2-49a9-a182-0a1cc9ab46fa" xlink:to="loc_srt_MajorCustomersAxis_2d2ccabc-54f6-4d8f-b229-22ef33eead21" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_2d2ccabc-54f6-4d8f-b229-22ef33eead21_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_2d2ccabc-54f6-4d8f-b229-22ef33eead21" xlink:to="loc_srt_NameOfMajorCustomerDomain_2d2ccabc-54f6-4d8f-b229-22ef33eead21_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_57ab4a41-498e-4c97-8ace-b03a42c1642a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_2d2ccabc-54f6-4d8f-b229-22ef33eead21" xlink:to="loc_srt_NameOfMajorCustomerDomain_57ab4a41-498e-4c97-8ace-b03a42c1642a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_CustomerAMember_c1edc722-2e05-4f39-b802-7c47314e71ae" xlink:href="soun-20250930.xsd#soun_CustomerAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_57ab4a41-498e-4c97-8ace-b03a42c1642a" xlink:to="loc_soun_CustomerAMember_c1edc722-2e05-4f39-b802-7c47314e71ae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_CustomerBMember_d47109ef-db4a-4ec4-bb11-374538e81392" xlink:href="soun-20250930.xsd#soun_CustomerBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_57ab4a41-498e-4c97-8ace-b03a42c1642a" xlink:to="loc_soun_CustomerBMember_d47109ef-db4a-4ec4-bb11-374538e81392" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_CustomerCMember_c7ec2e81-f778-4787-bae9-9e91555df6ad" xlink:href="soun-20250930.xsd#soun_CustomerCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_57ab4a41-498e-4c97-8ace-b03a42c1642a" xlink:to="loc_soun_CustomerCMember_c7ec2e81-f778-4787-bae9-9e91555df6ad" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_CustomerDMember_e330aad8-6579-4446-9424-5915068cc38a" xlink:href="soun-20250930.xsd#soun_CustomerDMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_57ab4a41-498e-4c97-8ace-b03a42c1642a" xlink:to="loc_soun_CustomerDMember_e330aad8-6579-4446-9424-5915068cc38a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_CustomerEMember_5851fd2f-3eb2-49c5-9ce1-0dee8093615c" xlink:href="soun-20250930.xsd#soun_CustomerEMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_57ab4a41-498e-4c97-8ace-b03a42c1642a" xlink:to="loc_soun_CustomerEMember_5851fd2f-3eb2-49c5-9ce1-0dee8093615c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_CustomerFMember_dc5e48cc-29ee-4196-97aa-58fbcedcacb9" xlink:href="soun-20250930.xsd#soun_CustomerFMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_57ab4a41-498e-4c97-8ace-b03a42c1642a" xlink:to="loc_soun_CustomerFMember_dc5e48cc-29ee-4196-97aa-58fbcedcacb9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_99eed98f-0eff-4827-a3de-418b5286b9eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_71e25dc8-5fd2-49a9-a182-0a1cc9ab46fa" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_99eed98f-0eff-4827-a3de-418b5286b9eb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_99eed98f-0eff-4827-a3de-418b5286b9eb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_99eed98f-0eff-4827-a3de-418b5286b9eb" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_99eed98f-0eff-4827-a3de-418b5286b9eb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_d2cce051-155d-4b17-b83b-118ef5c0e3af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_99eed98f-0eff-4827-a3de-418b5286b9eb" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_d2cce051-155d-4b17-b83b-118ef5c0e3af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableMember_7c454cbd-0a5a-41c7-bb7d-8f8596d2348c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_d2cce051-155d-4b17-b83b-118ef5c0e3af" xlink:to="loc_us-gaap_AccountsReceivableMember_7c454cbd-0a5a-41c7-bb7d-8f8596d2348c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_UnbilledReceivablesMember_d12d2dd0-20a2-4c1c-af15-f2d8122942e7" xlink:href="soun-20250930.xsd#soun_UnbilledReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_d2cce051-155d-4b17-b83b-118ef5c0e3af" xlink:to="loc_soun_UnbilledReceivablesMember_d12d2dd0-20a2-4c1c-af15-f2d8122942e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_d039b194-6f89-49a5-a16d-e0562e4ec9ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_d2cce051-155d-4b17-b83b-118ef5c0e3af" xlink:to="loc_us-gaap_SalesRevenueNetMember_d039b194-6f89-49a5-a16d-e0562e4ec9ba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_58c6206c-3a43-4ca3-a599-753e6206dc73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_ea765e77-c492-44b6-9f09-fa29d254c7d4" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_58c6206c-3a43-4ca3-a599-753e6206dc73" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_72f3be9f-d190-4628-9079-e8025e3c4ba0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_ea765e77-c492-44b6-9f09-fa29d254c7d4" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_72f3be9f-d190-4628-9079-e8025e3c4ba0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill_9628c088-52e1-41df-a48f-121c884f57dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_ea765e77-c492-44b6-9f09-fa29d254c7d4" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill_9628c088-52e1-41df-a48f-121c884f57dc" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/BUSINESSCOMBINATIONSNarrativeDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#BUSINESSCOMBINATIONSNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/BUSINESSCOMBINATIONSNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationSegmentAllocationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationSegmentAllocationTable_3aebf746-9b0c-4cb7-aa87-301a90dd3068" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationSegmentAllocationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_BusinessCombinationSegmentAllocationTable_3aebf746-9b0c-4cb7-aa87-301a90dd3068" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_6e5b6680-e408-4cec-8d14-1d8f75365bd6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationTable_3aebf746-9b0c-4cb7-aa87-301a90dd3068" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_6e5b6680-e408-4cec-8d14-1d8f75365bd6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6e5b6680-e408-4cec-8d14-1d8f75365bd6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_6e5b6680-e408-4cec-8d14-1d8f75365bd6" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6e5b6680-e408-4cec-8d14-1d8f75365bd6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_258a6bfa-4383-4419-ad88-4ac348ff7580" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_6e5b6680-e408-4cec-8d14-1d8f75365bd6" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_258a6bfa-4383-4419-ad88-4ac348ff7580" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_Synq3IncMember_a274d0b5-09bc-4498-9d3b-bd31c8e30db3" xlink:href="soun-20250930.xsd#soun_Synq3IncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_258a6bfa-4383-4419-ad88-4ac348ff7580" xlink:to="loc_soun_Synq3IncMember_a274d0b5-09bc-4498-9d3b-bd31c8e30db3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_AmeliaTechnologiesLLCMember_1aea0222-6daf-423a-935a-d5d85fe49982" xlink:href="soun-20250930.xsd#soun_AmeliaTechnologiesLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_258a6bfa-4383-4419-ad88-4ac348ff7580" xlink:to="loc_soun_AmeliaTechnologiesLLCMember_1aea0222-6daf-423a-935a-d5d85fe49982" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_InteractionsCorporationMember_cf36d47f-63d1-4ca7-9b98-81282209252b" xlink:href="soun-20250930.xsd#soun_InteractionsCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_258a6bfa-4383-4419-ad88-4ac348ff7580" xlink:to="loc_soun_InteractionsCorporationMember_cf36d47f-63d1-4ca7-9b98-81282209252b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_OtherAcquisitionMember_c438f1cb-ee7f-4bea-a810-04b11835592e" xlink:href="soun-20250930.xsd#soun_OtherAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_258a6bfa-4383-4419-ad88-4ac348ff7580" xlink:to="loc_soun_OtherAcquisitionMember_c438f1cb-ee7f-4bea-a810-04b11835592e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_b08b5268-dd3a-4a4e-84c5-820e7a20a031" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationTable_3aebf746-9b0c-4cb7-aa87-301a90dd3068" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_b08b5268-dd3a-4a4e-84c5-820e7a20a031" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_b08b5268-dd3a-4a4e-84c5-820e7a20a031_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_b08b5268-dd3a-4a4e-84c5-820e7a20a031" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_b08b5268-dd3a-4a4e-84c5-820e7a20a031_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_89dc4d61-7794-4a4b-9046-8cb4c2f66902" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_b08b5268-dd3a-4a4e-84c5-820e7a20a031" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_89dc4d61-7794-4a4b-9046-8cb4c2f66902" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationHoldbackLiabilityMember_298a9d47-5b62-4456-ac1c-ce99cc666d42" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationHoldbackLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_89dc4d61-7794-4a4b-9046-8cb4c2f66902" xlink:to="loc_soun_ContingentConsiderationHoldbackLiabilityMember_298a9d47-5b62-4456-ac1c-ce99cc666d42" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationEarnoutLiabilityMember_432c9ab4-6d9e-4f16-908b-b7158d987b11" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationEarnoutLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_89dc4d61-7794-4a4b-9046-8cb4c2f66902" xlink:to="loc_soun_ContingentConsiderationEarnoutLiabilityMember_432c9ab4-6d9e-4f16-908b-b7158d987b11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationDeferredLiabilityHoldbackToBeSettledInCashMember_5a350753-8458-45be-bea9-1922b1dac293" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationDeferredLiabilityHoldbackToBeSettledInCashMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_89dc4d61-7794-4a4b-9046-8cb4c2f66902" xlink:to="loc_soun_ContingentConsiderationDeferredLiabilityHoldbackToBeSettledInCashMember_5a350753-8458-45be-bea9-1922b1dac293" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationDeferredLiabilityHoldbackToBeSettledInSharesMember_ce0de5e7-e1ff-4b1d-8d96-b406451d2cbb" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationDeferredLiabilityHoldbackToBeSettledInSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_89dc4d61-7794-4a4b-9046-8cb4c2f66902" xlink:to="loc_soun_ContingentConsiderationDeferredLiabilityHoldbackToBeSettledInSharesMember_ce0de5e7-e1ff-4b1d-8d96-b406451d2cbb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationLiabilityHoldbackToBeSettledInCashMember_7b1900e0-2f90-4806-8ecc-e28adb775015" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationLiabilityHoldbackToBeSettledInCashMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_89dc4d61-7794-4a4b-9046-8cb4c2f66902" xlink:to="loc_soun_ContingentConsiderationLiabilityHoldbackToBeSettledInCashMember_7b1900e0-2f90-4806-8ecc-e28adb775015" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationLiabilityEarnoutToBeSettledInCashMember_28857083-b592-4d39-af93-26d90eea199a" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationLiabilityEarnoutToBeSettledInCashMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_89dc4d61-7794-4a4b-9046-8cb4c2f66902" xlink:to="loc_soun_ContingentConsiderationLiabilityEarnoutToBeSettledInCashMember_28857083-b592-4d39-af93-26d90eea199a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_UpfrontConsiderationMember_3bf3f4f0-90ce-4dd3-9436-923d3f420fe6" xlink:href="soun-20250930.xsd#soun_UpfrontConsiderationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_89dc4d61-7794-4a4b-9046-8cb4c2f66902" xlink:to="loc_soun_UpfrontConsiderationMember_3bf3f4f0-90ce-4dd3-9436-923d3f420fe6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_EscrowConsiderationWithholdingMember_1a57b5ca-965d-4bfd-96a2-1a565b495bfe" xlink:href="soun-20250930.xsd#soun_EscrowConsiderationWithholdingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_89dc4d61-7794-4a4b-9046-8cb4c2f66902" xlink:to="loc_soun_EscrowConsiderationWithholdingMember_1a57b5ca-965d-4bfd-96a2-1a565b495bfe" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_UpfrontPurchaseConsiderationMember_1275b2d3-5e75-4c79-8b06-a5e98525616a" xlink:href="soun-20250930.xsd#soun_UpfrontPurchaseConsiderationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_89dc4d61-7794-4a4b-9046-8cb4c2f66902" xlink:to="loc_soun_UpfrontPurchaseConsiderationMember_1275b2d3-5e75-4c79-8b06-a5e98525616a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationDeferredHoldbackMember_40dfdc36-6738-48af-82d4-79bc5fb2d20b" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationDeferredHoldbackMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_89dc4d61-7794-4a4b-9046-8cb4c2f66902" xlink:to="loc_soun_ContingentConsiderationDeferredHoldbackMember_40dfdc36-6738-48af-82d4-79bc5fb2d20b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationIndemnityHoldbackMember_fe458e95-25a3-497a-85c1-81325efd03c2" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationIndemnityHoldbackMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_89dc4d61-7794-4a4b-9046-8cb4c2f66902" xlink:to="loc_soun_ContingentConsiderationIndemnityHoldbackMember_fe458e95-25a3-497a-85c1-81325efd03c2" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationAdjustmentHoldbackMember_8bf57986-798b-4b7d-b65d-4af0e0b8a7bd" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationAdjustmentHoldbackMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_89dc4d61-7794-4a4b-9046-8cb4c2f66902" xlink:to="loc_soun_ContingentConsiderationAdjustmentHoldbackMember_8bf57986-798b-4b7d-b65d-4af0e0b8a7bd" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_b4e096dd-ca3e-40b3-9397-4cfca6b75418" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityInterestIssuedOrIssuableByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationTable_3aebf746-9b0c-4cb7-aa87-301a90dd3068" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_b4e096dd-ca3e-40b3-9397-4cfca6b75418" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_b4e096dd-ca3e-40b3-9397-4cfca6b75418_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_b4e096dd-ca3e-40b3-9397-4cfca6b75418" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_b4e096dd-ca3e-40b3-9397-4cfca6b75418_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_d4fcea17-fb4e-4fb1-afa7-352a61587560" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_b4e096dd-ca3e-40b3-9397-4cfca6b75418" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_d4fcea17-fb4e-4fb1-afa7-352a61587560" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_34e33efd-2993-48d1-8b9b-b210fc404fb4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_d4fcea17-fb4e-4fb1-afa7-352a61587560" xlink:to="loc_us-gaap_RestrictedStockMember_34e33efd-2993-48d1-8b9b-b210fc404fb4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_781b7180-0c31-4df6-bdb0-de200eb3c97b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_d4fcea17-fb4e-4fb1-afa7-352a61587560" xlink:to="loc_us-gaap_CommonStockMember_781b7180-0c31-4df6-bdb0-de200eb3c97b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_6c6a67e4-d74f-482c-932c-7fbb55e1517f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationTable_3aebf746-9b0c-4cb7-aa87-301a90dd3068" xlink:to="loc_us-gaap_StatementClassOfStockAxis_6c6a67e4-d74f-482c-932c-7fbb55e1517f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_6c6a67e4-d74f-482c-932c-7fbb55e1517f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_6c6a67e4-d74f-482c-932c-7fbb55e1517f" xlink:to="loc_us-gaap_ClassOfStockDomain_6c6a67e4-d74f-482c-932c-7fbb55e1517f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_7ded82fa-673c-4c64-b319-3cc1a9d578f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_6c6a67e4-d74f-482c-932c-7fbb55e1517f" xlink:to="loc_us-gaap_ClassOfStockDomain_7ded82fa-673c-4c64-b319-3cc1a9d578f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_bbf173a5-3548-4ed8-b74c-e5b879bd74dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_7ded82fa-673c-4c64-b319-3cc1a9d578f7" xlink:to="loc_us-gaap_CommonClassAMember_bbf173a5-3548-4ed8-b74c-e5b879bd74dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_3dbf8336-ca17-4029-a57b-0ba6b5572d04" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationTable_3aebf746-9b0c-4cb7-aa87-301a90dd3068" xlink:to="loc_srt_TitleOfIndividualAxis_3dbf8336-ca17-4029-a57b-0ba6b5572d04" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_3dbf8336-ca17-4029-a57b-0ba6b5572d04_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_3dbf8336-ca17-4029-a57b-0ba6b5572d04" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_3dbf8336-ca17-4029-a57b-0ba6b5572d04_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_8ffd1a2a-c3a6-4d4c-a17a-9212a77b10d9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_3dbf8336-ca17-4029-a57b-0ba6b5572d04" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_8ffd1a2a-c3a6-4d4c-a17a-9212a77b10d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ExecutiveOfficerMember_94a5d20d-21b1-448b-b6fc-db9e163514db" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ExecutiveOfficerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_8ffd1a2a-c3a6-4d4c-a17a-9212a77b10d9" xlink:to="loc_srt_ExecutiveOfficerMember_94a5d20d-21b1-448b-b6fc-db9e163514db" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_0923fdbb-a7b4-48a6-956d-667def1a6b4e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationTable_3aebf746-9b0c-4cb7-aa87-301a90dd3068" xlink:to="loc_srt_CounterpartyNameAxis_0923fdbb-a7b4-48a6-956d-667def1a6b4e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_0923fdbb-a7b4-48a6-956d-667def1a6b4e_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_0923fdbb-a7b4-48a6-956d-667def1a6b4e" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_0923fdbb-a7b4-48a6-956d-667def1a6b4e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_82f69a98-623c-446e-a724-759dfa231c4a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_0923fdbb-a7b4-48a6-956d-667def1a6b4e" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_82f69a98-623c-446e-a724-759dfa231c4a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_InteractionAcquisitionSellingShareholdersMember_54bca7bf-8fa4-4823-bed0-7489c2186ee2" xlink:href="soun-20250930.xsd#soun_InteractionAcquisitionSellingShareholdersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_82f69a98-623c-446e-a724-759dfa231c4a" xlink:to="loc_soun_InteractionAcquisitionSellingShareholdersMember_54bca7bf-8fa4-4823-bed0-7489c2186ee2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_c9eb049c-0542-44d3-8ccf-f89dcfa8c6f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationTable_3aebf746-9b0c-4cb7-aa87-301a90dd3068" xlink:to="loc_us-gaap_AwardTypeAxis_c9eb049c-0542-44d3-8ccf-f89dcfa8c6f5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c9eb049c-0542-44d3-8ccf-f89dcfa8c6f5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_c9eb049c-0542-44d3-8ccf-f89dcfa8c6f5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c9eb049c-0542-44d3-8ccf-f89dcfa8c6f5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9ad3e5e8-aab2-45c5-a654-26be5c1c8b9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_c9eb049c-0542-44d3-8ccf-f89dcfa8c6f5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9ad3e5e8-aab2-45c5-a654-26be5c1c8b9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_UnvestedRestrictedStockMember_17d7225b-8d8c-487a-a869-9857eda106c0" xlink:href="soun-20250930.xsd#soun_UnvestedRestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9ad3e5e8-aab2-45c5-a654-26be5c1c8b9d" xlink:to="loc_soun_UnvestedRestrictedStockMember_17d7225b-8d8c-487a-a869-9857eda106c0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_199d2dc4-aefc-4d5e-9c93-2d4be7ff60ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationTable_3aebf746-9b0c-4cb7-aa87-301a90dd3068" xlink:to="loc_us-gaap_DebtInstrumentAxis_199d2dc4-aefc-4d5e-9c93-2d4be7ff60ca" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_199d2dc4-aefc-4d5e-9c93-2d4be7ff60ca_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_199d2dc4-aefc-4d5e-9c93-2d4be7ff60ca" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_199d2dc4-aefc-4d5e-9c93-2d4be7ff60ca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_f197b698-4db0-4d14-8496-35d05b6bc048" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_199d2dc4-aefc-4d5e-9c93-2d4be7ff60ca" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_f197b698-4db0-4d14-8496-35d05b6bc048" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_AmeliaDebtMember_9f576fba-c876-4591-a5f3-6d9987c7dc3b" xlink:href="soun-20250930.xsd#soun_AmeliaDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_f197b698-4db0-4d14-8496-35d05b6bc048" xlink:to="loc_soun_AmeliaDebtMember_9f576fba-c876-4591-a5f3-6d9987c7dc3b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_9bfe83ad-e098-498c-9705-e33a1d01ca51" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationTable_3aebf746-9b0c-4cb7-aa87-301a90dd3068" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_9bfe83ad-e098-498c-9705-e33a1d01ca51" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_9bfe83ad-e098-498c-9705-e33a1d01ca51_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_9bfe83ad-e098-498c-9705-e33a1d01ca51" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_9bfe83ad-e098-498c-9705-e33a1d01ca51_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_004ec23d-9b5e-4906-8898-33df4dbafca9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_9bfe83ad-e098-498c-9705-e33a1d01ca51" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_004ec23d-9b5e-4906-8898-33df4dbafca9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_TermLoanMember_97b12499-2547-41ea-a058-882bfdc64d4d" xlink:href="soun-20250930.xsd#soun_TermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_004ec23d-9b5e-4906-8898-33df4dbafca9" xlink:to="loc_soun_TermLoanMember_97b12499-2547-41ea-a058-882bfdc64d4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_63464f7a-99fd-441e-9c07-99bc621d7803" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_63464f7a-99fd-441e-9c07-99bc621d7803" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_f707b0aa-ceeb-478c-89be-82beb56e98d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_f707b0aa-ceeb-478c-89be-82beb56e98d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_713d8ed0-0669-4e1d-b58a-6d3c4f4ca410" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_713d8ed0-0669-4e1d-b58a-6d3c4f4ca410" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_9968fbeb-c27c-455c-9a75-8d9ca8f660bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_9968fbeb-c27c-455c-9a75-8d9ca8f660bf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_bbb906fa-8193-4d89-b977-eecad3e0b742" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_bbb906fa-8193-4d89-b977-eecad3e0b742" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesSharesHigh_a7b16515-e2ea-46d2-b17a-73b0ed1cd1a9" xlink:href="soun-20250930.xsd#soun_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesSharesHigh"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_soun_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesSharesHigh_a7b16515-e2ea-46d2-b17a-73b0ed1cd1a9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationConsiderationIndemnificationPeriod_b89c1800-2cd8-4d15-b05e-4458b78bdfdb" xlink:href="soun-20250930.xsd#soun_BusinessCombinationConsiderationIndemnificationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_soun_BusinessCombinationConsiderationIndemnificationPeriod_b89c1800-2cd8-4d15-b05e-4458b78bdfdb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_90e2b894-8907-4e32-9ad8-d0aae90536cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_90e2b894-8907-4e32-9ad8-d0aae90536cf" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_aa71ac07-0e22-4cbc-ba45-2f847a698a50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_aa71ac07-0e22-4cbc-ba45-2f847a698a50" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_a306ddab-1c69-45b8-81ac-1ecb0fc16777" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_a306ddab-1c69-45b8-81ac-1ecb0fc16777" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_0150a4f5-d17f-48fd-a79d-e4bb6093b498" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_0150a4f5-d17f-48fd-a79d-e4bb6093b498" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_e42bc43a-19da-42ca-8039-eac9cd86b2ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_e42bc43a-19da-42ca-8039-eac9cd86b2ac" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_EscrowConsiderationHoldingPeriod_fde88e5b-b76e-4687-b27d-66d4a8d988a8" xlink:href="soun-20250930.xsd#soun_EscrowConsiderationHoldingPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_soun_EscrowConsiderationHoldingPeriod_fde88e5b-b76e-4687-b27d-66d4a8d988a8" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationContingentConsiderationShares_5e2c4251-0f9e-4903-8d0e-8fb209c998bd" xlink:href="soun-20250930.xsd#soun_BusinessCombinationContingentConsiderationShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_soun_BusinessCombinationContingentConsiderationShares_5e2c4251-0f9e-4903-8d0e-8fb209c998bd" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_cb481799-08d7-4699-b91f-88c5e56dcd9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_cb481799-08d7-4699-b91f-88c5e56dcd9f" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationIndemnificationAssetsAmountAsOfAcquisitionDate_1032db85-e263-482d-98b1-490bd5c616dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationIndemnificationAssetsAmountAsOfAcquisitionDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_BusinessCombinationIndemnificationAssetsAmountAsOfAcquisitionDate_1032db85-e263-482d-98b1-490bd5c616dd" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionSharePrice_717b1663-faf6-4e13-9792-81be5681a3e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionSharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_BusinessAcquisitionSharePrice_717b1663-faf6-4e13-9792-81be5681a3e7" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_a1936a2b-5878-4612-8351-3501e954bdfa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_a1936a2b-5878-4612-8351-3501e954bdfa" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsIncreaseDecreaseInAccruedLiabilities_50c16c86-68e2-4123-97cc-97aa2f4b4d23" xlink:href="soun-20250930.xsd#soun_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsIncreaseDecreaseInAccruedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_soun_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsIncreaseDecreaseInAccruedLiabilities_50c16c86-68e2-4123-97cc-97aa2f4b4d23" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsCurrentLiabilitiesOther_ad873700-b627-4f99-ac2a-b482aa0cc581" xlink:href="soun-20250930.xsd#soun_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsCurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_soun_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsCurrentLiabilitiesOther_ad873700-b627-4f99-ac2a-b482aa0cc581" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_3e84e9d5-359a-4223-a9a9-392668c7251d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_3e84e9d5-359a-4223-a9a9-392668c7251d" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForMergerRelatedCosts_266ef95c-584a-4aeb-8f57-3b4a79dead24" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForMergerRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_PaymentsForMergerRelatedCosts_266ef95c-584a-4aeb-8f57-3b4a79dead24" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_e042e820-22e5-462e-8753-11440ceb7a6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_e042e820-22e5-462e-8753-11440ceb7a6a" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_b65dc466-df32-4970-ad29-dc464bd19032" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_b65dc466-df32-4970-ad29-dc464bd19032" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_fa149d65-a01d-44fc-af69-1b14a88b5889" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_fa149d65-a01d-44fc-af69-1b14a88b5889" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_3a267b7a-c94e-4a0b-a83d-2fcca4756848" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_3a267b7a-c94e-4a0b-a83d-2fcca4756848" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount_a6dd9e1d-dfe9-4165-a867-dde5ae7a8fe9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_d86cfc66-2c3e-495b-8f2f-db8cf7dca59c" xlink:to="loc_us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount_a6dd9e1d-dfe9-4165-a867-dde5ae7a8fe9" xlink:type="arc" order="26"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/BUSINESSCOMBINATIONSScheduleofPurchasePriceDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#BUSINESSCOMBINATIONSScheduleofPurchasePriceDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/BUSINESSCOMBINATIONSScheduleofPurchasePriceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsTable_18d10a09-01fe-4cb1-ba3f-6588ee241e27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsTable_18d10a09-01fe-4cb1-ba3f-6588ee241e27" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_cba05cbf-b325-4983-9dc9-f567e0b3166e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsTable_18d10a09-01fe-4cb1-ba3f-6588ee241e27" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_cba05cbf-b325-4983-9dc9-f567e0b3166e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_cba05cbf-b325-4983-9dc9-f567e0b3166e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_cba05cbf-b325-4983-9dc9-f567e0b3166e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_cba05cbf-b325-4983-9dc9-f567e0b3166e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_dc51d5a6-a452-4582-befd-fc46fa7c355f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_cba05cbf-b325-4983-9dc9-f567e0b3166e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_dc51d5a6-a452-4582-befd-fc46fa7c355f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_Synq3IncMember_d7c83a2c-8822-4d3e-abd2-14ef654e4a26" xlink:href="soun-20250930.xsd#soun_Synq3IncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_dc51d5a6-a452-4582-befd-fc46fa7c355f" xlink:to="loc_soun_Synq3IncMember_d7c83a2c-8822-4d3e-abd2-14ef654e4a26" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_AmeliaTechnologiesLLCMember_78497c73-0c42-4172-912d-ccdeba2e042c" xlink:href="soun-20250930.xsd#soun_AmeliaTechnologiesLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_dc51d5a6-a452-4582-befd-fc46fa7c355f" xlink:to="loc_soun_AmeliaTechnologiesLLCMember_78497c73-0c42-4172-912d-ccdeba2e042c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_InteractionsCorporationMember_a3191103-bcc1-4311-8837-646c7ec367c9" xlink:href="soun-20250930.xsd#soun_InteractionsCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_dc51d5a6-a452-4582-befd-fc46fa7c355f" xlink:to="loc_soun_InteractionsCorporationMember_a3191103-bcc1-4311-8837-646c7ec367c9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_0496e913-1b03-43ea-b68a-fe75d9ed4489" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsTable_18d10a09-01fe-4cb1-ba3f-6588ee241e27" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_0496e913-1b03-43ea-b68a-fe75d9ed4489" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_0496e913-1b03-43ea-b68a-fe75d9ed4489_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_0496e913-1b03-43ea-b68a-fe75d9ed4489" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_0496e913-1b03-43ea-b68a-fe75d9ed4489_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_0f45d206-ee32-4869-9709-95d6f7703e9e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_0496e913-1b03-43ea-b68a-fe75d9ed4489" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_0f45d206-ee32-4869-9709-95d6f7703e9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationEarnoutLiabilityMember_6c44a44c-e10d-4410-a6e8-384817899013" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationEarnoutLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_0f45d206-ee32-4869-9709-95d6f7703e9e" xlink:to="loc_soun_ContingentConsiderationEarnoutLiabilityMember_6c44a44c-e10d-4410-a6e8-384817899013" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationHoldbackLiabilityMember_da718ec8-2106-41fe-976d-d1da6f95ce6b" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationHoldbackLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_0f45d206-ee32-4869-9709-95d6f7703e9e" xlink:to="loc_soun_ContingentConsiderationHoldbackLiabilityMember_da718ec8-2106-41fe-976d-d1da6f95ce6b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_EscrowConsiderationWithholdingMember_ccaa535d-6d11-4b67-8bc3-924ec0167acc" xlink:href="soun-20250930.xsd#soun_EscrowConsiderationWithholdingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_0f45d206-ee32-4869-9709-95d6f7703e9e" xlink:to="loc_soun_EscrowConsiderationWithholdingMember_ccaa535d-6d11-4b67-8bc3-924ec0167acc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationDeferredHoldbackMember_1a9913a1-7b37-439f-bc8d-642541f8d557" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationDeferredHoldbackMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_0f45d206-ee32-4869-9709-95d6f7703e9e" xlink:to="loc_soun_ContingentConsiderationDeferredHoldbackMember_1a9913a1-7b37-439f-bc8d-642541f8d557" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationLiabilityHoldbackToBeSettledInCashMember_aa979c8a-dbd6-4a24-86e7-356d7392c7ee" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationLiabilityHoldbackToBeSettledInCashMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_0f45d206-ee32-4869-9709-95d6f7703e9e" xlink:to="loc_soun_ContingentConsiderationLiabilityHoldbackToBeSettledInCashMember_aa979c8a-dbd6-4a24-86e7-356d7392c7ee" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_f229445f-7f45-45c9-9a97-e3b304b77ce3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_f229445f-7f45-45c9-9a97-e3b304b77ce3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_00254cf0-d99d-4b93-b908-cc220e02228c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_00254cf0-d99d-4b93-b908-cc220e02228c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_e646629d-9c10-4e61-954a-54d17adeb25d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_e646629d-9c10-4e61-954a-54d17adeb25d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_5c5b8677-86a9-487f-96df-8c8c7af1d0b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_5c5b8677-86a9-487f-96df-8c8c7af1d0b4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_f94ea545-0c09-425b-a7de-52cb39566e94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_f94ea545-0c09-425b-a7de-52cb39566e94" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_c4d964c6-985e-4f5a-9130-6af2b59e8ae0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_c4d964c6-985e-4f5a-9130-6af2b59e8ae0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_563a6b7e-e0e3-423a-8a0b-b2eccf9d2c9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_563a6b7e-e0e3-423a-8a0b-b2eccf9d2c9c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContractAssetAndUnbilledReceivableCurrent_4748b95d-325b-4592-b74b-0c84b87ca4c4" xlink:href="soun-20250930.xsd#soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContractAssetAndUnbilledReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContractAssetAndUnbilledReceivableCurrent_4748b95d-325b-4592-b74b-0c84b87ca4c4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_cb42aebe-2a93-40ca-8739-20f5c9a6704a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_cb42aebe-2a93-40ca-8739-20f5c9a6704a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRightOfUseAssets_5be7cdc3-c8e4-4bc2-a85d-d86ba84cf476" xlink:href="soun-20250930.xsd#soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRightOfUseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRightOfUseAssets_5be7cdc3-c8e4-4bc2-a85d-d86ba84cf476" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContractAssetAndUnbilledReceivableNonCurrent_25667721-5971-43a8-a2ec-6d4f4d0ed383" xlink:href="soun-20250930.xsd#soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContractAssetAndUnbilledReceivableNonCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContractAssetAndUnbilledReceivableNonCurrent_25667721-5971-43a8-a2ec-6d4f4d0ed383" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_87902748-ca11-402d-af25-043a5a6e5f61" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_87902748-ca11-402d-af25-043a5a6e5f61" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_f34b3b08-8b7f-4693-96aa-0bedbe7fcc3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_f34b3b08-8b7f-4693-96aa-0bedbe7fcc3a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_91b46010-8fbd-4313-94d8-57eabefd7b52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_91b46010-8fbd-4313-94d8-57eabefd7b52" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_86bcac34-a3c8-423b-b0c7-ec1c61e6cce0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_86bcac34-a3c8-423b-b0c7-ec1c61e6cce0" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedLiabilities_b7a424c2-b64b-42dc-80a4-aba137b15398" xlink:href="soun-20250930.xsd#soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedLiabilities_b7a424c2-b64b-42dc-80a4-aba137b15398" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesIncomeTaxLiability_eb1d7db8-aa51-473c-8ed1-0b762033f60c" xlink:href="soun-20250930.xsd#soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesIncomeTaxLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesIncomeTaxLiability_eb1d7db8-aa51-473c-8ed1-0b762033f60c" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt_2900d489-bb6a-4686-9e12-203f165b41ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt_2900d489-bb6a-4686-9e12-203f165b41ab" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOperatingLeaseLiability_e999758a-563a-467b-8379-fe97e2eedf68" xlink:href="soun-20250930.xsd#soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOperatingLeaseLiability_e999758a-563a-467b-8379-fe97e2eedf68" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesFinanceLeaseLiability_7f254177-df01-4ddf-8bec-9a047c08f890" xlink:href="soun-20250930.xsd#soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesFinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesFinanceLeaseLiability_7f254177-df01-4ddf-8bec-9a047c08f890" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_611d868b-575d-4f30-947d-971dd1b89978" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_611d868b-575d-4f30-947d-971dd1b89978" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_a833d195-57ae-49b8-94a6-e6e8df02dcdc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_a833d195-57ae-49b8-94a6-e6e8df02dcdc" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesDeferredRevenue_681f0d85-684c-4230-b263-6570b8db7b19" xlink:href="soun-20250930.xsd#soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesDeferredRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesDeferredRevenue_681f0d85-684c-4230-b263-6570b8db7b19" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_42c2aaec-51de-4fb2-bf19-c39dabb191be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_42c2aaec-51de-4fb2-bf19-c39dabb191be" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_24af3b1a-61f9-45fa-8e85-0cd8bd2b57c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_24af3b1a-61f9-45fa-8e85-0cd8bd2b57c0" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOperatingLeaseLiability_1c8eb1d5-c3d8-4a54-90e6-56e54d6a1d8b" xlink:href="soun-20250930.xsd#soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOperatingLeaseLiability_1c8eb1d5-c3d8-4a54-90e6-56e54d6a1d8b" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_1c6b4d6c-bf38-4577-9d78-530115a2164f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_1c6b4d6c-bf38-4577-9d78-530115a2164f" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesIncomeTaxLiabilityNet_40cb76ae-1a47-4646-ab8a-3e263f86b495" xlink:href="soun-20250930.xsd#soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesIncomeTaxLiabilityNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesIncomeTaxLiabilityNet_40cb76ae-1a47-4646-ab8a-3e263f86b495" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_e6a3b64c-73ab-498f-8588-934c9d6679fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_e6a3b64c-73ab-498f-8588-934c9d6679fc" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_9f236ba1-f182-48a0-afd9-7d3a25a29c70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_9f236ba1-f182-48a0-afd9-7d3a25a29c70" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_e5e1fb99-35fa-4789-9efb-7d000a9f4fc5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_Goodwill_e5e1fb99-35fa-4789-9efb-7d000a9f4fc5" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_651aaf76-f26d-4927-996a-2d0113e58e1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_ff4abb83-2c19-4ac3-8b53-de455c18a4f8" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_651aaf76-f26d-4927-996a-2d0113e58e1f" xlink:type="arc" order="31"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/BUSINESSCOMBINATIONSScheduleofFairValuesDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#BUSINESSCOMBINATIONSScheduleofFairValuesDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/BUSINESSCOMBINATIONSScheduleofFairValuesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_648da44e-7c45-42c1-96f0-20e97788004b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsTable_baf1ba28-ef4f-4946-9095-44d541b185ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_648da44e-7c45-42c1-96f0-20e97788004b" xlink:to="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsTable_baf1ba28-ef4f-4946-9095-44d541b185ea" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_f96129b6-02a9-4ba0-9590-71a1cc6fb775" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsTable_baf1ba28-ef4f-4946-9095-44d541b185ea" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_f96129b6-02a9-4ba0-9590-71a1cc6fb775" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f96129b6-02a9-4ba0-9590-71a1cc6fb775_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_f96129b6-02a9-4ba0-9590-71a1cc6fb775" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f96129b6-02a9-4ba0-9590-71a1cc6fb775_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d3d6f4ac-e296-46e0-9801-1c9882dc5091" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_f96129b6-02a9-4ba0-9590-71a1cc6fb775" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d3d6f4ac-e296-46e0-9801-1c9882dc5091" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_Synq3IncMember_9d9f202a-d9ce-48a4-a4d9-a827b83c9be3" xlink:href="soun-20250930.xsd#soun_Synq3IncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d3d6f4ac-e296-46e0-9801-1c9882dc5091" xlink:to="loc_soun_Synq3IncMember_9d9f202a-d9ce-48a4-a4d9-a827b83c9be3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_AmeliaTechnologiesLLCMember_fff87e94-b953-4155-a0d5-8840afd9031b" xlink:href="soun-20250930.xsd#soun_AmeliaTechnologiesLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d3d6f4ac-e296-46e0-9801-1c9882dc5091" xlink:to="loc_soun_AmeliaTechnologiesLLCMember_fff87e94-b953-4155-a0d5-8840afd9031b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_InteractionsCorporationMember_1e8631cb-ec72-481c-a674-1fa2921bf50a" xlink:href="soun-20250930.xsd#soun_InteractionsCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d3d6f4ac-e296-46e0-9801-1c9882dc5091" xlink:to="loc_soun_InteractionsCorporationMember_1e8631cb-ec72-481c-a674-1fa2921bf50a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_OtherAcquisitionMember_e251ba23-88a8-4d1e-a87d-9452075235e8" xlink:href="soun-20250930.xsd#soun_OtherAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d3d6f4ac-e296-46e0-9801-1c9882dc5091" xlink:to="loc_soun_OtherAcquisitionMember_e251ba23-88a8-4d1e-a87d-9452075235e8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_37bc2a9e-4f59-46a1-a3f9-97e9137d246c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsTable_baf1ba28-ef4f-4946-9095-44d541b185ea" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_37bc2a9e-4f59-46a1-a3f9-97e9137d246c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_37bc2a9e-4f59-46a1-a3f9-97e9137d246c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_37bc2a9e-4f59-46a1-a3f9-97e9137d246c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_37bc2a9e-4f59-46a1-a3f9-97e9137d246c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_3d417f1a-47c8-407c-9f81-2d9857209c27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_37bc2a9e-4f59-46a1-a3f9-97e9137d246c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_3d417f1a-47c8-407c-9f81-2d9857209c27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_67308017-d513-4eb0-b852-29f692ebafb8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_3d417f1a-47c8-407c-9f81-2d9857209c27" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_67308017-d513-4eb0-b852-29f692ebafb8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_4bb099e1-5e02-4fd7-8ed8-87e0dc6526de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerRelatedIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_3d417f1a-47c8-407c-9f81-2d9857209c27" xlink:to="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_4bb099e1-5e02-4fd7-8ed8-87e0dc6526de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksMember_554ce90d-503f-4d9c-be86-819fbe6219a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TrademarksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_3d417f1a-47c8-407c-9f81-2d9857209c27" xlink:to="loc_us-gaap_TrademarksMember_554ce90d-503f-4d9c-be86-819fbe6219a5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ConversationDataMember_ab884f04-e1b4-4780-807a-b4c2a3fe550b" xlink:href="soun-20250930.xsd#soun_ConversationDataMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_3d417f1a-47c8-407c-9f81-2d9857209c27" xlink:to="loc_soun_ConversationDataMember_ab884f04-e1b4-4780-807a-b4c2a3fe550b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_b901c03f-ef49-4139-a843-3bb5880ea351" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_648da44e-7c45-42c1-96f0-20e97788004b" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_b901c03f-ef49-4139-a843-3bb5880ea351" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_60b87622-1bcc-4e5c-80d1-cb1b22b770a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_648da44e-7c45-42c1-96f0-20e97788004b" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_60b87622-1bcc-4e5c-80d1-cb1b22b770a2" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/BUSINESSCOMBINATIONSScheduleofProformaDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#BUSINESSCOMBINATIONSScheduleofProformaDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/BUSINESSCOMBINATIONSScheduleofProformaDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_07d4d7a6-5931-46cb-80ac-534cb5b846d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationSegmentAllocationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationSegmentAllocationTable_f5472db4-7ea0-4278-8542-fe2d30e1ed43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationSegmentAllocationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_07d4d7a6-5931-46cb-80ac-534cb5b846d3" xlink:to="loc_us-gaap_BusinessCombinationSegmentAllocationTable_f5472db4-7ea0-4278-8542-fe2d30e1ed43" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_9a3b2123-4bbd-4804-97d5-0b93dfbe0888" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationTable_f5472db4-7ea0-4278-8542-fe2d30e1ed43" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_9a3b2123-4bbd-4804-97d5-0b93dfbe0888" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9a3b2123-4bbd-4804-97d5-0b93dfbe0888_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9a3b2123-4bbd-4804-97d5-0b93dfbe0888" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_9a3b2123-4bbd-4804-97d5-0b93dfbe0888_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1f303f5f-f55b-4d7f-950d-32e58c1cefca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_9a3b2123-4bbd-4804-97d5-0b93dfbe0888" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1f303f5f-f55b-4d7f-950d-32e58c1cefca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SYNQ3AndAmeliaMember_226b3e4f-a190-434c-9023-fbfbbb696604" xlink:href="soun-20250930.xsd#soun_SYNQ3AndAmeliaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1f303f5f-f55b-4d7f-950d-32e58c1cefca" xlink:to="loc_soun_SYNQ3AndAmeliaMember_226b3e4f-a190-434c-9023-fbfbbb696604" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_InteractionsAcquisitionMember_f8af36d6-df8b-4c7d-a4db-1b1241ec7600" xlink:href="soun-20250930.xsd#soun_InteractionsAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_1f303f5f-f55b-4d7f-950d-32e58c1cefca" xlink:to="loc_soun_InteractionsAcquisitionMember_f8af36d6-df8b-4c7d-a4db-1b1241ec7600" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_ca9f3b66-7d08-48c6-b7ad-41daec15585e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_07d4d7a6-5931-46cb-80ac-534cb5b846d3" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_ca9f3b66-7d08-48c6-b7ad-41daec15585e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_8ca53ffa-5a3a-419e-b858-242374010a00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_07d4d7a6-5931-46cb-80ac-534cb5b846d3" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_8ca53ffa-5a3a-419e-b858-242374010a00" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/REVENUERECOGNITIONNarrativesDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#REVENUERECOGNITIONNarrativesDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/REVENUERECOGNITIONNarrativesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_bbbe447d-7c30-43a6-ae06-e4ee4cc7f44f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_8bf800fc-086e-4871-9e8b-93d64db316b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_bbbe447d-7c30-43a6-ae06-e4ee4cc7f44f" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_8bf800fc-086e-4871-9e8b-93d64db316b2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_1a83449b-2207-4409-b7d0-5322e10c87d8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_8bf800fc-086e-4871-9e8b-93d64db316b2" xlink:to="loc_srt_ProductOrServiceAxis_1a83449b-2207-4409-b7d0-5322e10c87d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_1a83449b-2207-4409-b7d0-5322e10c87d8_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_1a83449b-2207-4409-b7d0-5322e10c87d8" xlink:to="loc_srt_ProductsAndServicesDomain_1a83449b-2207-4409-b7d0-5322e10c87d8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_fe56e99d-7a46-4211-a8a2-fb90653d6bb5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_1a83449b-2207-4409-b7d0-5322e10c87d8" xlink:to="loc_srt_ProductsAndServicesDomain_fe56e99d-7a46-4211-a8a2-fb90653d6bb5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ProfessionalServiceMember_354494d3-899b-4e8e-935c-8766c3cec1f8" xlink:href="soun-20250930.xsd#soun_ProfessionalServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_fe56e99d-7a46-4211-a8a2-fb90653d6bb5" xlink:to="loc_soun_ProfessionalServiceMember_354494d3-899b-4e8e-935c-8766c3cec1f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_fb3c23aa-603b-41cb-b953-29fd1760f72a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TimingOfTransferOfGoodOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_8bf800fc-086e-4871-9e8b-93d64db316b2" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_fb3c23aa-603b-41cb-b953-29fd1760f72a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_fb3c23aa-603b-41cb-b953-29fd1760f72a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_fb3c23aa-603b-41cb-b953-29fd1760f72a" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_fb3c23aa-603b-41cb-b953-29fd1760f72a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_d29a7340-fd36-43f6-8e10-19d91617ef62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_fb3c23aa-603b-41cb-b953-29fd1760f72a" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_d29a7340-fd36-43f6-8e10-19d91617ef62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredOverTimeMember_b98e3944-762b-4eaf-9f49-314132b7fc0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransferredOverTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_d29a7340-fd36-43f6-8e10-19d91617ef62" xlink:to="loc_us-gaap_TransferredOverTimeMember_b98e3944-762b-4eaf-9f49-314132b7fc0a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredAtPointInTimeMember_6a30729f-2a64-40d3-871a-850240e17b60" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransferredAtPointInTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_d29a7340-fd36-43f6-8e10-19d91617ef62" xlink:to="loc_us-gaap_TransferredAtPointInTimeMember_6a30729f-2a64-40d3-871a-850240e17b60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_4969ad46-6698-4de7-8ba6-ae26b82c62da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_8bf800fc-086e-4871-9e8b-93d64db316b2" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_4969ad46-6698-4de7-8ba6-ae26b82c62da" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuePerformanceObligationDescriptionOfTiming_30dad5d0-1335-4414-9eb5-f96f3d6275c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuePerformanceObligationDescriptionOfTiming"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_bbbe447d-7c30-43a6-ae06-e4ee4cc7f44f" xlink:to="loc_us-gaap_RevenuePerformanceObligationDescriptionOfTiming_30dad5d0-1335-4414-9eb5-f96f3d6275c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_377e7c30-f80c-44cb-931f-966edd838deb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_bbbe447d-7c30-43a6-ae06-e4ee4cc7f44f" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_377e7c30-f80c-44cb-931f-966edd838deb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNet_6f04c491-c5d7-4445-9ac7-cbffb5f0df50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_bbbe447d-7c30-43a6-ae06-e4ee4cc7f44f" xlink:to="loc_us-gaap_AccountsReceivableNet_6f04c491-c5d7-4445-9ac7-cbffb5f0df50" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetCurrent_345522ba-90a9-44c8-88d7-f13fcb9fa33d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerAssetNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_bbbe447d-7c30-43a6-ae06-e4ee4cc7f44f" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetCurrent_345522ba-90a9-44c8-88d7-f13fcb9fa33d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_dd6a22da-f2f3-4329-8a51-84d1f6ae8aa1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_bbbe447d-7c30-43a6-ae06-e4ee4cc7f44f" xlink:to="loc_us-gaap_ContractWithCustomerLiability_dd6a22da-f2f3-4329-8a51-84d1f6ae8aa1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_79e06e11-e03e-4185-ac42-e9237a84342c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_bbbe447d-7c30-43a6-ae06-e4ee4cc7f44f" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_79e06e11-e03e-4185-ac42-e9237a84342c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_dd456303-4fa9-4c12-bc16-aa3f492bcf55" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_bbbe447d-7c30-43a6-ae06-e4ee4cc7f44f" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_dd456303-4fa9-4c12-bc16-aa3f492bcf55" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_a72b178d-0673-424e-a31e-7e28cbe7b289" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_bbbe447d-7c30-43a6-ae06-e4ee4cc7f44f" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_a72b178d-0673-424e-a31e-7e28cbe7b289" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/REVENUERECOGNITIONNarrativesDetails_1" xlink:type="simple" xlink:href="soun-20250930.xsd#REVENUERECOGNITIONNarrativesDetails_1"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/REVENUERECOGNITIONNarrativesDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_bbbe447d-7c30-43a6-ae06-e4ee4cc7f44f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_8bf800fc-086e-4871-9e8b-93d64db316b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_bbbe447d-7c30-43a6-ae06-e4ee4cc7f44f" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_8bf800fc-086e-4871-9e8b-93d64db316b2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_1a83449b-2207-4409-b7d0-5322e10c87d8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_8bf800fc-086e-4871-9e8b-93d64db316b2" xlink:to="loc_srt_ProductOrServiceAxis_1a83449b-2207-4409-b7d0-5322e10c87d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_1a83449b-2207-4409-b7d0-5322e10c87d8_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_1a83449b-2207-4409-b7d0-5322e10c87d8" xlink:to="loc_srt_ProductsAndServicesDomain_1a83449b-2207-4409-b7d0-5322e10c87d8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_fe56e99d-7a46-4211-a8a2-fb90653d6bb5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_1a83449b-2207-4409-b7d0-5322e10c87d8" xlink:to="loc_srt_ProductsAndServicesDomain_fe56e99d-7a46-4211-a8a2-fb90653d6bb5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ProfessionalServiceMember_354494d3-899b-4e8e-935c-8766c3cec1f8" xlink:href="soun-20250930.xsd#soun_ProfessionalServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_fe56e99d-7a46-4211-a8a2-fb90653d6bb5" xlink:to="loc_soun_ProfessionalServiceMember_354494d3-899b-4e8e-935c-8766c3cec1f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_fb3c23aa-603b-41cb-b953-29fd1760f72a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TimingOfTransferOfGoodOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_8bf800fc-086e-4871-9e8b-93d64db316b2" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_fb3c23aa-603b-41cb-b953-29fd1760f72a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_fb3c23aa-603b-41cb-b953-29fd1760f72a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_fb3c23aa-603b-41cb-b953-29fd1760f72a" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_fb3c23aa-603b-41cb-b953-29fd1760f72a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_d29a7340-fd36-43f6-8e10-19d91617ef62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_fb3c23aa-603b-41cb-b953-29fd1760f72a" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_d29a7340-fd36-43f6-8e10-19d91617ef62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredOverTimeMember_b98e3944-762b-4eaf-9f49-314132b7fc0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransferredOverTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_d29a7340-fd36-43f6-8e10-19d91617ef62" xlink:to="loc_us-gaap_TransferredOverTimeMember_b98e3944-762b-4eaf-9f49-314132b7fc0a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredAtPointInTimeMember_6a30729f-2a64-40d3-871a-850240e17b60" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransferredAtPointInTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_d29a7340-fd36-43f6-8e10-19d91617ef62" xlink:to="loc_us-gaap_TransferredAtPointInTimeMember_6a30729f-2a64-40d3-871a-850240e17b60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuePerformanceObligationDescriptionOfTiming_30dad5d0-1335-4414-9eb5-f96f3d6275c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuePerformanceObligationDescriptionOfTiming"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_bbbe447d-7c30-43a6-ae06-e4ee4cc7f44f" xlink:to="loc_us-gaap_RevenuePerformanceObligationDescriptionOfTiming_30dad5d0-1335-4414-9eb5-f96f3d6275c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_377e7c30-f80c-44cb-931f-966edd838deb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_bbbe447d-7c30-43a6-ae06-e4ee4cc7f44f" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_377e7c30-f80c-44cb-931f-966edd838deb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNet_6f04c491-c5d7-4445-9ac7-cbffb5f0df50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_bbbe447d-7c30-43a6-ae06-e4ee4cc7f44f" xlink:to="loc_us-gaap_AccountsReceivableNet_6f04c491-c5d7-4445-9ac7-cbffb5f0df50" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetCurrent_345522ba-90a9-44c8-88d7-f13fcb9fa33d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerAssetNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_bbbe447d-7c30-43a6-ae06-e4ee4cc7f44f" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetCurrent_345522ba-90a9-44c8-88d7-f13fcb9fa33d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_dd6a22da-f2f3-4329-8a51-84d1f6ae8aa1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_bbbe447d-7c30-43a6-ae06-e4ee4cc7f44f" xlink:to="loc_us-gaap_ContractWithCustomerLiability_dd6a22da-f2f3-4329-8a51-84d1f6ae8aa1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_79e06e11-e03e-4185-ac42-e9237a84342c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_bbbe447d-7c30-43a6-ae06-e4ee4cc7f44f" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_79e06e11-e03e-4185-ac42-e9237a84342c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_dd456303-4fa9-4c12-bc16-aa3f492bcf55" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_bbbe447d-7c30-43a6-ae06-e4ee4cc7f44f" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_dd456303-4fa9-4c12-bc16-aa3f492bcf55" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_a72b178d-0673-424e-a31e-7e28cbe7b289" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_bbbe447d-7c30-43a6-ae06-e4ee4cc7f44f" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_a72b178d-0673-424e-a31e-7e28cbe7b289" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/REVENUERECOGNITIONScheduleofrevenuesundereachperformanceDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#REVENUERECOGNITIONScheduleofrevenuesundereachperformanceDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/REVENUERECOGNITIONScheduleofrevenuesundereachperformanceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_49bd50ac-139b-4aae-967f-e148d3ae62c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_3b8b4540-e906-4236-affb-4422c9920d4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_49bd50ac-139b-4aae-967f-e148d3ae62c2" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_3b8b4540-e906-4236-affb-4422c9920d4d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_f4e12755-af8e-404e-ab66-170bed9b1ee0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_3b8b4540-e906-4236-affb-4422c9920d4d" xlink:to="loc_srt_ProductOrServiceAxis_f4e12755-af8e-404e-ab66-170bed9b1ee0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_f4e12755-af8e-404e-ab66-170bed9b1ee0_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_f4e12755-af8e-404e-ab66-170bed9b1ee0" xlink:to="loc_srt_ProductsAndServicesDomain_f4e12755-af8e-404e-ab66-170bed9b1ee0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_70434e19-ba6f-4f5d-a79a-2e2af27e614e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_f4e12755-af8e-404e-ab66-170bed9b1ee0" xlink:to="loc_srt_ProductsAndServicesDomain_70434e19-ba6f-4f5d-a79a-2e2af27e614e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_HostedServicesMember_4dc788f4-c944-44c4-9bd4-68329ad27880" xlink:href="soun-20250930.xsd#soun_HostedServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_70434e19-ba6f-4f5d-a79a-2e2af27e614e" xlink:to="loc_soun_HostedServicesMember_4dc788f4-c944-44c4-9bd4-68329ad27880" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_LicensingMember_1bd4cc41-0448-43c1-8106-5115456ffb66" xlink:href="soun-20250930.xsd#soun_LicensingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_70434e19-ba6f-4f5d-a79a-2e2af27e614e" xlink:to="loc_soun_LicensingMember_1bd4cc41-0448-43c1-8106-5115456ffb66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ProfessionalServiceMember_8b3d2bab-d3a4-40a6-9628-3c6a3ad49fac" xlink:href="soun-20250930.xsd#soun_ProfessionalServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_70434e19-ba6f-4f5d-a79a-2e2af27e614e" xlink:to="loc_soun_ProfessionalServiceMember_8b3d2bab-d3a4-40a6-9628-3c6a3ad49fac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MonetizationMember_9485c845-7ad2-41df-9e6a-b1b46dc832c9" xlink:href="soun-20250930.xsd#soun_MonetizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_70434e19-ba6f-4f5d-a79a-2e2af27e614e" xlink:to="loc_soun_MonetizationMember_9485c845-7ad2-41df-9e6a-b1b46dc832c9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_3de226e1-f66a-464e-8e15-48e1431f41b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_49bd50ac-139b-4aae-967f-e148d3ae62c2" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_3de226e1-f66a-464e-8e15-48e1431f41b6" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/REVENUERECOGNITIONScheduleofdisaggregatesrevenuebygeographiclocationDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#REVENUERECOGNITIONScheduleofdisaggregatesrevenuebygeographiclocationDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/REVENUERECOGNITIONScheduleofdisaggregatesrevenuebygeographiclocationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_422e7985-45eb-42e7-87cf-97bbd045899b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_bcc8300d-d17c-423b-95a8-cd2ab604cb7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_422e7985-45eb-42e7-87cf-97bbd045899b" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_bcc8300d-d17c-423b-95a8-cd2ab604cb7f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_5d62093d-478b-470d-a8f0-b5ccc33c14a6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_bcc8300d-d17c-423b-95a8-cd2ab604cb7f" xlink:to="loc_srt_StatementGeographicalAxis_5d62093d-478b-470d-a8f0-b5ccc33c14a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_5d62093d-478b-470d-a8f0-b5ccc33c14a6_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_5d62093d-478b-470d-a8f0-b5ccc33c14a6" xlink:to="loc_srt_SegmentGeographicalDomain_5d62093d-478b-470d-a8f0-b5ccc33c14a6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_fd0106e9-8fb6-4b05-ba5c-f84a37377c8a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_5d62093d-478b-470d-a8f0-b5ccc33c14a6" xlink:to="loc_srt_SegmentGeographicalDomain_fd0106e9-8fb6-4b05-ba5c-f84a37377c8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_aa538210-2b85-4672-8977-109ed4a91818" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_fd0106e9-8fb6-4b05-ba5c-f84a37377c8a" xlink:to="loc_country_US_aa538210-2b85-4672-8977-109ed4a91818" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN_21c54942-5b6b-4133-81a9-885b867df72e" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_fd0106e9-8fb6-4b05-ba5c-f84a37377c8a" xlink:to="loc_country_CN_21c54942-5b6b-4133-81a9-885b867df72e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_exch_GSXK_b72d58a7-8fff-4ef0-9698-31945eeecc7b" xlink:href="https://xbrl.sec.gov/exch/2025/exch-2025.xsd#exch_GSXK"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_fd0106e9-8fb6-4b05-ba5c-f84a37377c8a" xlink:to="loc_exch_GSXK_b72d58a7-8fff-4ef0-9698-31945eeecc7b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_FR_ae30abd8-6a48-4ee4-b58a-db49e9550817" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_FR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_fd0106e9-8fb6-4b05-ba5c-f84a37377c8a" xlink:to="loc_country_FR_ae30abd8-6a48-4ee4-b58a-db49e9550817" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_OtherCountriesMember_546cb51d-9a1f-476b-88f5-beccbb980675" xlink:href="soun-20250930.xsd#soun_OtherCountriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_fd0106e9-8fb6-4b05-ba5c-f84a37377c8a" xlink:to="loc_soun_OtherCountriesMember_546cb51d-9a1f-476b-88f5-beccbb980675" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_fc228d9b-a475-4cea-819b-0071db67c1ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_422e7985-45eb-42e7-87cf-97bbd045899b" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_fc228d9b-a475-4cea-819b-0071db67c1ac" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/REVENUERECOGNITIONScheduleofrevenuerecognitionpatternDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#REVENUERECOGNITIONScheduleofrevenuerecognitionpatternDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/REVENUERECOGNITIONScheduleofrevenuerecognitionpatternDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_5e9e3919-d604-45e7-bb43-9ff1e1139df3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_16684e65-5afe-416d-8a50-738b08f47988" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_5e9e3919-d604-45e7-bb43-9ff1e1139df3" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_16684e65-5afe-416d-8a50-738b08f47988" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_9bb12c76-6a1b-48e2-a03a-f2c3583223b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TimingOfTransferOfGoodOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_16684e65-5afe-416d-8a50-738b08f47988" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_9bb12c76-6a1b-48e2-a03a-f2c3583223b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_9bb12c76-6a1b-48e2-a03a-f2c3583223b6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_9bb12c76-6a1b-48e2-a03a-f2c3583223b6" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_9bb12c76-6a1b-48e2-a03a-f2c3583223b6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_1a4dafaf-76e7-4b6d-a14e-1374dccd0f7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_9bb12c76-6a1b-48e2-a03a-f2c3583223b6" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_1a4dafaf-76e7-4b6d-a14e-1374dccd0f7f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredOverTimeMember_e0e4220b-0e34-47bd-b2e3-8cad7d7aa1aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransferredOverTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_1a4dafaf-76e7-4b6d-a14e-1374dccd0f7f" xlink:to="loc_us-gaap_TransferredOverTimeMember_e0e4220b-0e34-47bd-b2e3-8cad7d7aa1aa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredAtPointInTimeMember_668ab48b-19e0-4250-9c5d-96a5363321ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransferredAtPointInTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_1a4dafaf-76e7-4b6d-a14e-1374dccd0f7f" xlink:to="loc_us-gaap_TransferredAtPointInTimeMember_668ab48b-19e0-4250-9c5d-96a5363321ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_8f9c1aad-c771-4263-8c64-7079d8de5902" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_5e9e3919-d604-45e7-bb43-9ff1e1139df3" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_8f9c1aad-c771-4263-8c64-7079d8de5902" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/REVENUERECOGNITIONScheduleofServiceDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#REVENUERECOGNITIONScheduleofServiceDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/REVENUERECOGNITIONScheduleofServiceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_3650fae5-2f2d-4061-a2fd-0514a98f391a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_a0d3a174-8747-4651-a0fd-d347d2c08d96" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_3650fae5-2f2d-4061-a2fd-0514a98f391a" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_a0d3a174-8747-4651-a0fd-d347d2c08d96" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_aaa64db2-3e0d-432f-aca4-58cec235bf19" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_a0d3a174-8747-4651-a0fd-d347d2c08d96" xlink:to="loc_srt_ProductOrServiceAxis_aaa64db2-3e0d-432f-aca4-58cec235bf19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_aaa64db2-3e0d-432f-aca4-58cec235bf19_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_aaa64db2-3e0d-432f-aca4-58cec235bf19" xlink:to="loc_srt_ProductsAndServicesDomain_aaa64db2-3e0d-432f-aca4-58cec235bf19_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_83d6b786-2076-4955-a7b8-c7a08245ebb6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_aaa64db2-3e0d-432f-aca4-58cec235bf19" xlink:to="loc_srt_ProductsAndServicesDomain_83d6b786-2076-4955-a7b8-c7a08245ebb6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ServiceSubscriptionsMember_11a0a546-25da-45f9-ac42-ca016ed26017" xlink:href="soun-20250930.xsd#soun_ServiceSubscriptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_83d6b786-2076-4955-a7b8-c7a08245ebb6" xlink:to="loc_soun_ServiceSubscriptionsMember_11a0a546-25da-45f9-ac42-ca016ed26017" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ProductRoyaltiesMember_75c95bc8-a491-4642-a8c5-11ae90f617e1" xlink:href="soun-20250930.xsd#soun_ProductRoyaltiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_83d6b786-2076-4955-a7b8-c7a08245ebb6" xlink:to="loc_soun_ProductRoyaltiesMember_75c95bc8-a491-4642-a8c5-11ae90f617e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MonetizationMember_92863690-b827-4754-81e3-73d9add6642c" xlink:href="soun-20250930.xsd#soun_MonetizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_83d6b786-2076-4955-a7b8-c7a08245ebb6" xlink:to="loc_soun_MonetizationMember_92863690-b827-4754-81e3-73d9add6642c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_4200a2e6-ddb4-4c6a-8e0d-87dbaa9055b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_3650fae5-2f2d-4061-a2fd-0514a98f391a" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_4200a2e6-ddb4-4c6a-8e0d-87dbaa9055b7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/GOODWILLANDINTANGIBLEASSETSScheduleofFiniteLivedIntangibleAssetsDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#GOODWILLANDINTANGIBLEASSETSScheduleofFiniteLivedIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/GOODWILLANDINTANGIBLEASSETSScheduleofFiniteLivedIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_d8514ae9-06b9-4f33-b119-7962094f1986" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_86dedb21-a322-4a36-904a-67a60bf2ef7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_d8514ae9-06b9-4f33-b119-7962094f1986" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_86dedb21-a322-4a36-904a-67a60bf2ef7f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_5a08e3c4-757a-43c3-8b13-c09976e4dbb1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_86dedb21-a322-4a36-904a-67a60bf2ef7f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_5a08e3c4-757a-43c3-8b13-c09976e4dbb1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_5a08e3c4-757a-43c3-8b13-c09976e4dbb1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_5a08e3c4-757a-43c3-8b13-c09976e4dbb1" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_5a08e3c4-757a-43c3-8b13-c09976e4dbb1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1aa4db1a-68e7-47ba-beb3-0f321f2a6a96" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_5a08e3c4-757a-43c3-8b13-c09976e4dbb1" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1aa4db1a-68e7-47ba-beb3-0f321f2a6a96" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_df81fc9e-06ce-4b4c-b2a1-01434be6086a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1aa4db1a-68e7-47ba-beb3-0f321f2a6a96" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_df81fc9e-06ce-4b4c-b2a1-01434be6086a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_4e5a614d-559d-40c3-8b0e-9b5f8ea7bd44" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1aa4db1a-68e7-47ba-beb3-0f321f2a6a96" xlink:to="loc_us-gaap_CustomerRelationshipsMember_4e5a614d-559d-40c3-8b0e-9b5f8ea7bd44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_81ffa347-a167-44fe-9571-c81f697cfff0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1aa4db1a-68e7-47ba-beb3-0f321f2a6a96" xlink:to="loc_us-gaap_TradeNamesMember_81ffa347-a167-44fe-9571-c81f697cfff0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ConversationDataMember_df7db245-e167-40e6-8ab0-7b0ad0b5014c" xlink:href="soun-20250930.xsd#soun_ConversationDataMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_1aa4db1a-68e7-47ba-beb3-0f321f2a6a96" xlink:to="loc_soun_ConversationDataMember_df7db245-e167-40e6-8ab0-7b0ad0b5014c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_e9bb4964-0a67-42ff-abea-8968d62bae0c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_86dedb21-a322-4a36-904a-67a60bf2ef7f" xlink:to="loc_srt_RangeAxis_e9bb4964-0a67-42ff-abea-8968d62bae0c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e9bb4964-0a67-42ff-abea-8968d62bae0c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_e9bb4964-0a67-42ff-abea-8968d62bae0c" xlink:to="loc_srt_RangeMember_e9bb4964-0a67-42ff-abea-8968d62bae0c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_794b206d-5435-405b-8d23-5f471bf409d5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_e9bb4964-0a67-42ff-abea-8968d62bae0c" xlink:to="loc_srt_RangeMember_794b206d-5435-405b-8d23-5f471bf409d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_96b31439-db6e-48f9-9ad7-9e2a6d10c755" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_794b206d-5435-405b-8d23-5f471bf409d5" xlink:to="loc_srt_MinimumMember_96b31439-db6e-48f9-9ad7-9e2a6d10c755" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_dd824787-857c-459a-b0ef-447d3028635b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_794b206d-5435-405b-8d23-5f471bf409d5" xlink:to="loc_srt_MaximumMember_dd824787-857c-459a-b0ef-447d3028635b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_a7e42880-e53b-4deb-beea-a85e170ddeca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_d8514ae9-06b9-4f33-b119-7962094f1986" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_a7e42880-e53b-4deb-beea-a85e170ddeca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_b79bc2fd-4504-4bc7-844c-f600dcdb0a62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_d8514ae9-06b9-4f33-b119-7962094f1986" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_b79bc2fd-4504-4bc7-844c-f600dcdb0a62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_dbfcad2f-3bed-4157-9f25-9b824a44cc6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_d8514ae9-06b9-4f33-b119-7962094f1986" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_dbfcad2f-3bed-4157-9f25-9b824a44cc6c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_fd5433d6-3e58-48b9-a9df-1fb70a601786" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_d8514ae9-06b9-4f33-b119-7962094f1986" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_fd5433d6-3e58-48b9-a9df-1fb70a601786" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/COMMITMENTSANDCONTINGENCIESNarrativesDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#COMMITMENTSANDCONTINGENCIESNarrativesDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/COMMITMENTSANDCONTINGENCIESNarrativesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_feca8b1d-539f-420f-bf58-b4b1371eb453" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_f2e47317-8dbf-4393-bb6e-212b7e90c3f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_feca8b1d-539f-420f-bf58-b4b1371eb453" xlink:to="loc_us-gaap_LossContingenciesTable_f2e47317-8dbf-4393-bb6e-212b7e90c3f4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_998b7b03-f06e-4b98-a0bb-db211097174a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_f2e47317-8dbf-4393-bb6e-212b7e90c3f4" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_998b7b03-f06e-4b98-a0bb-db211097174a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_998b7b03-f06e-4b98-a0bb-db211097174a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_998b7b03-f06e-4b98-a0bb-db211097174a" xlink:to="loc_us-gaap_LossContingencyNatureDomain_998b7b03-f06e-4b98-a0bb-db211097174a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_5c8d9952-76f3-48ea-8e06-694ec0395ff8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_998b7b03-f06e-4b98-a0bb-db211097174a" xlink:to="loc_us-gaap_LossContingencyNatureDomain_5c8d9952-76f3-48ea-8e06-694ec0395ff8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_PossibleSalesTaxLiabilityMember_50e07a59-d07f-4769-aed6-3e81f145c515" xlink:href="soun-20250930.xsd#soun_PossibleSalesTaxLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_5c8d9952-76f3-48ea-8e06-694ec0395ff8" xlink:to="loc_soun_PossibleSalesTaxLiabilityMember_50e07a59-d07f-4769-aed6-3e81f145c515" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_64ad49d8-c236-4dfa-b08d-77a29d83475b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_f2e47317-8dbf-4393-bb6e-212b7e90c3f4" xlink:to="loc_srt_LitigationCaseAxis_64ad49d8-c236-4dfa-b08d-77a29d83475b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_64ad49d8-c236-4dfa-b08d-77a29d83475b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_64ad49d8-c236-4dfa-b08d-77a29d83475b" xlink:to="loc_srt_LitigationCaseTypeDomain_64ad49d8-c236-4dfa-b08d-77a29d83475b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_4433ce7b-e6c9-4264-b024-fdd888421bcc" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_64ad49d8-c236-4dfa-b08d-77a29d83475b" xlink:to="loc_srt_LitigationCaseTypeDomain_4433ce7b-e6c9-4264-b024-fdd888421bcc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SYNQ3LitigationAgainstTEBOMember_ae1160e7-a77a-470d-8800-d42a5ec1b674" xlink:href="soun-20250930.xsd#soun_SYNQ3LitigationAgainstTEBOMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_4433ce7b-e6c9-4264-b024-fdd888421bcc" xlink:to="loc_soun_SYNQ3LitigationAgainstTEBOMember_ae1160e7-a77a-470d-8800-d42a5ec1b674" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyAccrualAtCarryingValue_d6e8ec3a-3fb9-4543-96f5-aa659534635f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyAccrualAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_feca8b1d-539f-420f-bf58-b4b1371eb453" xlink:to="loc_us-gaap_LossContingencyAccrualAtCarryingValue_d6e8ec3a-3fb9-4543-96f5-aa659534635f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermPurchaseCommitmentPeriod_215ff734-4ee5-49e0-901d-d903dce5afa6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermPurchaseCommitmentPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_feca8b1d-539f-420f-bf58-b4b1371eb453" xlink:to="loc_us-gaap_LongtermPurchaseCommitmentPeriod_215ff734-4ee5-49e0-901d-d903dce5afa6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationReserveCurrent_631421f1-9ec7-4a3f-8606-82589be0be21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LitigationReserveCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_feca8b1d-539f-420f-bf58-b4b1371eb453" xlink:to="loc_us-gaap_LitigationReserveCurrent_631421f1-9ec7-4a3f-8606-82589be0be21" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/WARRANTSDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#WARRANTSDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/WARRANTSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightLineItems_ee517245-d27f-4c47-80d8-cbedf3f4b34c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightTable_c0e26c2e-d689-4e95-a224-bba35f290b1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_ee517245-d27f-4c47-80d8-cbedf3f4b34c" xlink:to="loc_us-gaap_ClassOfWarrantOrRightTable_c0e26c2e-d689-4e95-a224-bba35f290b1c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_52e10701-03ae-4c72-ac67-966fb6ac45dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_c0e26c2e-d689-4e95-a224-bba35f290b1c" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_52e10701-03ae-4c72-ac67-966fb6ac45dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_52e10701-03ae-4c72-ac67-966fb6ac45dd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_52e10701-03ae-4c72-ac67-966fb6ac45dd" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_52e10701-03ae-4c72-ac67-966fb6ac45dd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_f5af5961-2058-459a-a37c-e35bf93e5550" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_52e10701-03ae-4c72-ac67-966fb6ac45dd" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_f5af5961-2058-459a-a37c-e35bf93e5550" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_TermLoanWarrantsMember_02b75b12-c01a-488d-8579-e701875f6d7d" xlink:href="soun-20250930.xsd#soun_TermLoanWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_f5af5961-2058-459a-a37c-e35bf93e5550" xlink:to="loc_soun_TermLoanWarrantsMember_02b75b12-c01a-488d-8579-e701875f6d7d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_PublicWarrantsMember_cadaf462-6358-4a23-8ec3-c9f9c3ddf903" xlink:href="soun-20250930.xsd#soun_PublicWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_f5af5961-2058-459a-a37c-e35bf93e5550" xlink:to="loc_soun_PublicWarrantsMember_cadaf462-6358-4a23-8ec3-c9f9c3ddf903" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_PrivateWarrantsMember_62cd3ac3-4171-4508-a5c0-8e35a289e4bb" xlink:href="soun-20250930.xsd#soun_PrivateWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_f5af5961-2058-459a-a37c-e35bf93e5550" xlink:to="loc_soun_PrivateWarrantsMember_62cd3ac3-4171-4508-a5c0-8e35a289e4bb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_6417aba5-1eed-43c0-8cd5-5b75b3c8562b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_c0e26c2e-d689-4e95-a224-bba35f290b1c" xlink:to="loc_us-gaap_StatementClassOfStockAxis_6417aba5-1eed-43c0-8cd5-5b75b3c8562b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_6417aba5-1eed-43c0-8cd5-5b75b3c8562b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_6417aba5-1eed-43c0-8cd5-5b75b3c8562b" xlink:to="loc_us-gaap_ClassOfStockDomain_6417aba5-1eed-43c0-8cd5-5b75b3c8562b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_f228ba69-ebbf-4ff2-95a5-c84fb5a342c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_6417aba5-1eed-43c0-8cd5-5b75b3c8562b" xlink:to="loc_us-gaap_ClassOfStockDomain_f228ba69-ebbf-4ff2-95a5-c84fb5a342c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_9fa6c2fe-4657-4a46-9c4f-c30710cf06c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_f228ba69-ebbf-4ff2-95a5-c84fb5a342c5" xlink:to="loc_us-gaap_CommonClassAMember_9fa6c2fe-4657-4a46-9c4f-c30710cf06c4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_0ee23a39-9083-480c-a0fb-98a1c2925abb" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_c0e26c2e-d689-4e95-a224-bba35f290b1c" xlink:to="loc_dei_LegalEntityAxis_0ee23a39-9083-480c-a0fb-98a1c2925abb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_0ee23a39-9083-480c-a0fb-98a1c2925abb_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_0ee23a39-9083-480c-a0fb-98a1c2925abb" xlink:to="loc_dei_EntityDomain_0ee23a39-9083-480c-a0fb-98a1c2925abb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_ee1f883e-577f-4ac9-8dc8-bca6271bf290" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_0ee23a39-9083-480c-a0fb-98a1c2925abb" xlink:to="loc_dei_EntityDomain_ee1f883e-577f-4ac9-8dc8-bca6271bf290" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ArchimedesTechSPACPartnersCoATSPMember_6db77a1b-bac6-48b7-a46b-a2b5249d7cb9" xlink:href="soun-20250930.xsd#soun_ArchimedesTechSPACPartnersCoATSPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_ee1f883e-577f-4ac9-8dc8-bca6271bf290" xlink:to="loc_soun_ArchimedesTechSPACPartnersCoATSPMember_6db77a1b-bac6-48b7-a46b-a2b5249d7cb9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_TriggeringEventsAxis_e1b508d8-c146-48c9-998d-6907d317ec76" xlink:href="soun-20250930.xsd#soun_TriggeringEventsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_c0e26c2e-d689-4e95-a224-bba35f290b1c" xlink:to="loc_soun_TriggeringEventsAxis_e1b508d8-c146-48c9-998d-6907d317ec76" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_TriggeringEventsDomain_e1b508d8-c146-48c9-998d-6907d317ec76_default" xlink:href="soun-20250930.xsd#soun_TriggeringEventsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_soun_TriggeringEventsAxis_e1b508d8-c146-48c9-998d-6907d317ec76" xlink:to="loc_soun_TriggeringEventsDomain_e1b508d8-c146-48c9-998d-6907d317ec76_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_TriggeringEventsDomain_0cf2e991-188a-432e-bb6c-f2740cfa3b65" xlink:href="soun-20250930.xsd#soun_TriggeringEventsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_soun_TriggeringEventsAxis_e1b508d8-c146-48c9-998d-6907d317ec76" xlink:to="loc_soun_TriggeringEventsDomain_0cf2e991-188a-432e-bb6c-f2740cfa3b65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SharePriceEqualOrExceedsEighteenDollarsMember_937b9dea-8a5b-44e3-8c63-4cfb899a820e" xlink:href="soun-20250930.xsd#soun_SharePriceEqualOrExceedsEighteenDollarsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_soun_TriggeringEventsDomain_0cf2e991-188a-432e-bb6c-f2740cfa3b65" xlink:to="loc_soun_SharePriceEqualOrExceedsEighteenDollarsMember_937b9dea-8a5b-44e3-8c63-4cfb899a820e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_09fe7379-3778-4a41-9ee3-456d8a1a802c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_c0e26c2e-d689-4e95-a224-bba35f290b1c" xlink:to="loc_srt_RangeAxis_09fe7379-3778-4a41-9ee3-456d8a1a802c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_09fe7379-3778-4a41-9ee3-456d8a1a802c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_09fe7379-3778-4a41-9ee3-456d8a1a802c" xlink:to="loc_srt_RangeMember_09fe7379-3778-4a41-9ee3-456d8a1a802c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_ca1558bf-e3e6-4f47-8ab1-ba35bd384cef" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_09fe7379-3778-4a41-9ee3-456d8a1a802c" xlink:to="loc_srt_RangeMember_ca1558bf-e3e6-4f47-8ab1-ba35bd384cef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_a315329e-615a-48c5-9276-3dea167d489e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_ca1558bf-e3e6-4f47-8ab1-ba35bd384cef" xlink:to="loc_srt_MinimumMember_a315329e-615a-48c5-9276-3dea167d489e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_e1e5f7ab-d3f8-4996-9c84-0b074e9e5947" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_ca1558bf-e3e6-4f47-8ab1-ba35bd384cef" xlink:to="loc_srt_MaximumMember_e1e5f7ab-d3f8-4996-9c84-0b074e9e5947" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_dd0cc708-52f7-4d26-8525-6b3da26f63e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_ee517245-d27f-4c47-80d8-cbedf3f4b34c" xlink:to="loc_us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights_dd0cc708-52f7-4d26-8525-6b3da26f63e6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_f157f096-8491-4e33-9c80-d2821f70f611" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_ee517245-d27f-4c47-80d8-cbedf3f4b34c" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_f157f096-8491-4e33-9c80-d2821f70f611" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ClassOfWarrantsRightsExercisePeriodTerm_dfb57235-f0c1-41b8-bd11-58dcd3a9a758" xlink:href="soun-20250930.xsd#soun_ClassOfWarrantsRightsExercisePeriodTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_ee517245-d27f-4c47-80d8-cbedf3f4b34c" xlink:to="loc_soun_ClassOfWarrantsRightsExercisePeriodTerm_dfb57235-f0c1-41b8-bd11-58dcd3a9a758" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantsNotSettleableInCashFairValueDisclosure_600ba724-29c5-4f7e-9d7c-be74193f0df6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WarrantsNotSettleableInCashFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_ee517245-d27f-4c47-80d8-cbedf3f4b34c" xlink:to="loc_us-gaap_WarrantsNotSettleableInCashFairValueDisclosure_600ba724-29c5-4f7e-9d7c-be74193f0df6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockSharesIssued1_3e71abad-2825-44a2-a2b3-b0094f500707" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConversionOfStockSharesIssued1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_ee517245-d27f-4c47-80d8-cbedf3f4b34c" xlink:to="loc_us-gaap_ConversionOfStockSharesIssued1_3e71abad-2825-44a2-a2b3-b0094f500707" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightOutstanding_ba90893e-9bcd-433d-a56c-87f590a3083e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_ee517245-d27f-4c47-80d8-cbedf3f4b34c" xlink:to="loc_us-gaap_ClassOfWarrantOrRightOutstanding_ba90893e-9bcd-433d-a56c-87f590a3083e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ClassOfWarrantsRedemptionPricePerUnit_a18ac1ff-da78-421c-b5c3-74c2efe235ec" xlink:href="soun-20250930.xsd#soun_ClassOfWarrantsRedemptionPricePerUnit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_ee517245-d27f-4c47-80d8-cbedf3f4b34c" xlink:to="loc_soun_ClassOfWarrantsRedemptionPricePerUnit_a18ac1ff-da78-421c-b5c3-74c2efe235ec" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ClassOfWarrantsRedemptionNoticePeriod_b01852d0-8fbb-4b23-8cc2-9c3a2856e15a" xlink:href="soun-20250930.xsd#soun_ClassOfWarrantsRedemptionNoticePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_ee517245-d27f-4c47-80d8-cbedf3f4b34c" xlink:to="loc_soun_ClassOfWarrantsRedemptionNoticePeriod_b01852d0-8fbb-4b23-8cc2-9c3a2856e15a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ClassOfWarrantOrRightTriggerPrice_05893a02-8aa3-44f4-a7ad-10acab0897da" xlink:href="soun-20250930.xsd#soun_ClassOfWarrantOrRightTriggerPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_ee517245-d27f-4c47-80d8-cbedf3f4b34c" xlink:to="loc_soun_ClassOfWarrantOrRightTriggerPrice_05893a02-8aa3-44f4-a7ad-10acab0897da" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_NumberOfConsecutiveTradingDaysForDeterminingSharePrice_e92872f0-3e0a-448f-b6a0-fe08bbe8b4a1" xlink:href="soun-20250930.xsd#soun_NumberOfConsecutiveTradingDaysForDeterminingSharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_ee517245-d27f-4c47-80d8-cbedf3f4b34c" xlink:to="loc_soun_NumberOfConsecutiveTradingDaysForDeterminingSharePrice_e92872f0-3e0a-448f-b6a0-fe08bbe8b4a1" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_79fa3433-ca11-43e9-905a-6910f9d564f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_ee517245-d27f-4c47-80d8-cbedf3f4b34c" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_79fa3433-ca11-43e9-905a-6910f9d564f1" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ClassOfWarrantOrRightWarrantsExercised_c5c17c1b-a48e-42f6-9829-27fff6fceb1d" xlink:href="soun-20250930.xsd#soun_ClassOfWarrantOrRightWarrantsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_ee517245-d27f-4c47-80d8-cbedf3f4b34c" xlink:to="loc_soun_ClassOfWarrantOrRightWarrantsExercised_c5c17c1b-a48e-42f6-9829-27fff6fceb1d" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/NOTEPAYABLENarrativeDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#NOTEPAYABLENarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/NOTEPAYABLENarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_5de684a9-1c41-4680-a849-ffd73de4d7a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_us-gaap_DebtInstrumentTable_5de684a9-1c41-4680-a849-ffd73de4d7a5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_28b1c077-1eaa-42e2-bf3d-5f3aea0da5cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_5de684a9-1c41-4680-a849-ffd73de4d7a5" xlink:to="loc_us-gaap_CreditFacilityAxis_28b1c077-1eaa-42e2-bf3d-5f3aea0da5cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_28b1c077-1eaa-42e2-bf3d-5f3aea0da5cd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_28b1c077-1eaa-42e2-bf3d-5f3aea0da5cd" xlink:to="loc_us-gaap_CreditFacilityDomain_28b1c077-1eaa-42e2-bf3d-5f3aea0da5cd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_bf74868c-2349-4190-8c73-8cc18cae468b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_28b1c077-1eaa-42e2-bf3d-5f3aea0da5cd" xlink:to="loc_us-gaap_CreditFacilityDomain_bf74868c-2349-4190-8c73-8cc18cae468b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_7e392004-7a95-4f20-85cd-2f5afdb82a01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_bf74868c-2349-4190-8c73-8cc18cae468b" xlink:to="loc_us-gaap_SecuredDebtMember_7e392004-7a95-4f20-85cd-2f5afdb82a01" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_3e80341e-c354-47d3-bd06-01f2740efd96" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_5de684a9-1c41-4680-a849-ffd73de4d7a5" xlink:to="loc_us-gaap_DebtInstrumentAxis_3e80341e-c354-47d3-bd06-01f2740efd96" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_3e80341e-c354-47d3-bd06-01f2740efd96_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_3e80341e-c354-47d3-bd06-01f2740efd96" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_3e80341e-c354-47d3-bd06-01f2740efd96_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_29611bab-ca01-4b9e-b570-cb46053c4a26" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_3e80341e-c354-47d3-bd06-01f2740efd96" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_29611bab-ca01-4b9e-b570-cb46053c4a26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_TermLoanMember_1110faf8-c84e-4e18-b6b5-fa62fa4b6cec" xlink:href="soun-20250930.xsd#soun_TermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_29611bab-ca01-4b9e-b570-cb46053c4a26" xlink:to="loc_soun_TermLoanMember_1110faf8-c84e-4e18-b6b5-fa62fa4b6cec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableOtherPayablesMember_f81a8cf1-3bbf-4db8-8c6e-82f2cde4963c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesPayableOtherPayablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_29611bab-ca01-4b9e-b570-cb46053c4a26" xlink:to="loc_us-gaap_NotesPayableOtherPayablesMember_f81a8cf1-3bbf-4db8-8c6e-82f2cde4963c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_PayoffLetterMember_4f2d8dcc-f871-47cd-a574-d946ad9e373a" xlink:href="soun-20250930.xsd#soun_PayoffLetterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_29611bab-ca01-4b9e-b570-cb46053c4a26" xlink:to="loc_soun_PayoffLetterMember_4f2d8dcc-f871-47cd-a574-d946ad9e373a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_AmeliaDebtMember_7fd4110d-d29f-4ecc-a5dc-4e4477a20132" xlink:href="soun-20250930.xsd#soun_AmeliaDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_29611bab-ca01-4b9e-b570-cb46053c4a26" xlink:to="loc_soun_AmeliaDebtMember_7fd4110d-d29f-4ecc-a5dc-4e4477a20132" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_AmeliaDebtPayoffLetterMember_8df82c28-93b4-4c65-b1bd-28abd4d40837" xlink:href="soun-20250930.xsd#soun_AmeliaDebtPayoffLetterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_29611bab-ca01-4b9e-b570-cb46053c4a26" xlink:to="loc_soun_AmeliaDebtPayoffLetterMember_8df82c28-93b4-4c65-b1bd-28abd4d40837" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_DebtInstrumentCashPremiumRepaymentsPeriodAxis_c5960e93-59ed-4919-aafe-e4f1f262e6ac" xlink:href="soun-20250930.xsd#soun_DebtInstrumentCashPremiumRepaymentsPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_5de684a9-1c41-4680-a849-ffd73de4d7a5" xlink:to="loc_soun_DebtInstrumentCashPremiumRepaymentsPeriodAxis_c5960e93-59ed-4919-aafe-e4f1f262e6ac" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_DebtInstrumentCashPremiumRepaymentsPeriodDomain_c5960e93-59ed-4919-aafe-e4f1f262e6ac_default" xlink:href="soun-20250930.xsd#soun_DebtInstrumentCashPremiumRepaymentsPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_soun_DebtInstrumentCashPremiumRepaymentsPeriodAxis_c5960e93-59ed-4919-aafe-e4f1f262e6ac" xlink:to="loc_soun_DebtInstrumentCashPremiumRepaymentsPeriodDomain_c5960e93-59ed-4919-aafe-e4f1f262e6ac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_DebtInstrumentCashPremiumRepaymentsPeriodDomain_012236bf-11bc-4c54-be96-5659500c35a9" xlink:href="soun-20250930.xsd#soun_DebtInstrumentCashPremiumRepaymentsPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_soun_DebtInstrumentCashPremiumRepaymentsPeriodAxis_c5960e93-59ed-4919-aafe-e4f1f262e6ac" xlink:to="loc_soun_DebtInstrumentCashPremiumRepaymentsPeriodDomain_012236bf-11bc-4c54-be96-5659500c35a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_DebtInstrumentCashPremiumRepaymentsPeriodOneMember_c8e9721e-3a0f-4ab2-ad0d-1a4f8373bceb" xlink:href="soun-20250930.xsd#soun_DebtInstrumentCashPremiumRepaymentsPeriodOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_soun_DebtInstrumentCashPremiumRepaymentsPeriodDomain_012236bf-11bc-4c54-be96-5659500c35a9" xlink:to="loc_soun_DebtInstrumentCashPremiumRepaymentsPeriodOneMember_c8e9721e-3a0f-4ab2-ad0d-1a4f8373bceb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_DebtInstrumentCashPremiumRepaymentsPeriodThreeMember_a43fa637-829a-4b9d-bfbf-c4018792d7f1" xlink:href="soun-20250930.xsd#soun_DebtInstrumentCashPremiumRepaymentsPeriodThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_soun_DebtInstrumentCashPremiumRepaymentsPeriodDomain_012236bf-11bc-4c54-be96-5659500c35a9" xlink:to="loc_soun_DebtInstrumentCashPremiumRepaymentsPeriodThreeMember_a43fa637-829a-4b9d-bfbf-c4018792d7f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_996b45c4-60d0-4b90-99ed-fd02f95c3673" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_5de684a9-1c41-4680-a849-ffd73de4d7a5" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_996b45c4-60d0-4b90-99ed-fd02f95c3673" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_996b45c4-60d0-4b90-99ed-fd02f95c3673_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_996b45c4-60d0-4b90-99ed-fd02f95c3673" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_996b45c4-60d0-4b90-99ed-fd02f95c3673_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_ff2e5d7a-4a0d-4a78-8843-fd15f3aee8ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_996b45c4-60d0-4b90-99ed-fd02f95c3673" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_ff2e5d7a-4a0d-4a78-8843-fd15f3aee8ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableOtherPayablesMember_f53bfd27-627b-4bda-b189-c218a88b5de3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesPayableOtherPayablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_ff2e5d7a-4a0d-4a78-8843-fd15f3aee8ae" xlink:to="loc_us-gaap_NotesPayableOtherPayablesMember_f53bfd27-627b-4bda-b189-c218a88b5de3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_5ebdcbf9-fc2c-457f-9ade-a53f56d79032" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_ff2e5d7a-4a0d-4a78-8843-fd15f3aee8ae" xlink:to="loc_us-gaap_SecuredDebtMember_5ebdcbf9-fc2c-457f-9ade-a53f56d79032" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_TermLoanMember_82188d0f-1c5b-4338-a8d0-26f9ce4cbfa8" xlink:href="soun-20250930.xsd#soun_TermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_ff2e5d7a-4a0d-4a78-8843-fd15f3aee8ae" xlink:to="loc_soun_TermLoanMember_82188d0f-1c5b-4338-a8d0-26f9ce4cbfa8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_59a9cf55-1d2f-414d-8278-0310a5da739e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_5de684a9-1c41-4680-a849-ffd73de4d7a5" xlink:to="loc_us-gaap_VariableRateAxis_59a9cf55-1d2f-414d-8278-0310a5da739e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_59a9cf55-1d2f-414d-8278-0310a5da739e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_59a9cf55-1d2f-414d-8278-0310a5da739e" xlink:to="loc_us-gaap_VariableRateDomain_59a9cf55-1d2f-414d-8278-0310a5da739e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_98bcfa72-5fd7-427f-893a-ea9e4879e14b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_59a9cf55-1d2f-414d-8278-0310a5da739e" xlink:to="loc_us-gaap_VariableRateDomain_98bcfa72-5fd7-427f-893a-ea9e4879e14b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_TermSOFRMember_c74bbcaa-936c-4843-aa5b-679f3f8570cf" xlink:href="soun-20250930.xsd#soun_TermSOFRMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_98bcfa72-5fd7-427f-893a-ea9e4879e14b" xlink:to="loc_soun_TermSOFRMember_c74bbcaa-936c-4843-aa5b-679f3f8570cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalFundsEffectiveSwapRateMember_4b5e8203-535e-43dd-a874-a594dfe60b0f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FederalFundsEffectiveSwapRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_98bcfa72-5fd7-427f-893a-ea9e4879e14b" xlink:to="loc_us-gaap_FederalFundsEffectiveSwapRateMember_4b5e8203-535e-43dd-a874-a594dfe60b0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_AdjustableRateMember_e57bafbd-f103-4f4b-9cbc-546ce40b78e9" xlink:href="soun-20250930.xsd#soun_AdjustableRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_98bcfa72-5fd7-427f-893a-ea9e4879e14b" xlink:to="loc_soun_AdjustableRateMember_e57bafbd-f103-4f4b-9cbc-546ce40b78e9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SecuredOvernightFinancingRateMember_8894fa0c-fa7e-457f-9570-6f60e5b6d8a7" xlink:href="soun-20250930.xsd#soun_SecuredOvernightFinancingRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_98bcfa72-5fd7-427f-893a-ea9e4879e14b" xlink:to="loc_soun_SecuredOvernightFinancingRateMember_8894fa0c-fa7e-457f-9570-6f60e5b6d8a7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_AlternateBaseRateMember_79d686cd-0993-47c1-8e47-c60483d88aca" xlink:href="soun-20250930.xsd#soun_AlternateBaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_98bcfa72-5fd7-427f-893a-ea9e4879e14b" xlink:to="loc_soun_AlternateBaseRateMember_79d686cd-0993-47c1-8e47-c60483d88aca" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_VariableRateComponentAxis_4504f4b1-cae4-44a8-abac-17db2c5c3300" xlink:href="soun-20250930.xsd#soun_VariableRateComponentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_5de684a9-1c41-4680-a849-ffd73de4d7a5" xlink:to="loc_soun_VariableRateComponentAxis_4504f4b1-cae4-44a8-abac-17db2c5c3300" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_VariableRateComponentDomain_4504f4b1-cae4-44a8-abac-17db2c5c3300_default" xlink:href="soun-20250930.xsd#soun_VariableRateComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_soun_VariableRateComponentAxis_4504f4b1-cae4-44a8-abac-17db2c5c3300" xlink:to="loc_soun_VariableRateComponentDomain_4504f4b1-cae4-44a8-abac-17db2c5c3300_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_VariableRateComponentDomain_47db1b16-03c0-4a7c-a77f-019066aa70af" xlink:href="soun-20250930.xsd#soun_VariableRateComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_soun_VariableRateComponentAxis_4504f4b1-cae4-44a8-abac-17db2c5c3300" xlink:to="loc_soun_VariableRateComponentDomain_47db1b16-03c0-4a7c-a77f-019066aa70af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_VariableRateComponentOneMember_0556fdb0-9536-41f7-9351-675218af6de9" xlink:href="soun-20250930.xsd#soun_VariableRateComponentOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_soun_VariableRateComponentDomain_47db1b16-03c0-4a7c-a77f-019066aa70af" xlink:to="loc_soun_VariableRateComponentOneMember_0556fdb0-9536-41f7-9351-675218af6de9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_VariableRateComponentTwoMember_7fb0448d-8b4c-4712-8724-db74cc54dc08" xlink:href="soun-20250930.xsd#soun_VariableRateComponentTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_soun_VariableRateComponentDomain_47db1b16-03c0-4a7c-a77f-019066aa70af" xlink:to="loc_soun_VariableRateComponentTwoMember_7fb0448d-8b4c-4712-8724-db74cc54dc08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_85887979-90bc-4a91-823e-0a747b9950f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_85887979-90bc-4a91-823e-0a747b9950f4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_LineOfCreditFacilityAccordionFeatureAdditionalBorrowingCapacity_a1a56dc2-624d-41de-b7db-e71b7e11e15c" xlink:href="soun-20250930.xsd#soun_LineOfCreditFacilityAccordionFeatureAdditionalBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_soun_LineOfCreditFacilityAccordionFeatureAdditionalBorrowingCapacity_a1a56dc2-624d-41de-b7db-e71b7e11e15c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_DebtInstrumentCashPremiumRepaymentPercentageOfDebtRequiredToBePaid_82b2d176-2bc9-4b8c-bf67-ba2131858fe6" xlink:href="soun-20250930.xsd#soun_DebtInstrumentCashPremiumRepaymentPercentageOfDebtRequiredToBePaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_soun_DebtInstrumentCashPremiumRepaymentPercentageOfDebtRequiredToBePaid_82b2d176-2bc9-4b8c-bf67-ba2131858fe6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_DebtInstrumentCovenantInitialPeriodWithCollateralProtectionInsurance_b8847189-72ed-4f1e-ba7f-10183bcae2b6" xlink:href="soun-20250930.xsd#soun_DebtInstrumentCovenantInitialPeriodWithCollateralProtectionInsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_soun_DebtInstrumentCovenantInitialPeriodWithCollateralProtectionInsurance_b8847189-72ed-4f1e-ba7f-10183bcae2b6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ExtinguishmentOfDebtAmount_d2f51180-e16b-46a2-b0c0-7124d594ffc9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ExtinguishmentOfDebtAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_us-gaap_ExtinguishmentOfDebtAmount_d2f51180-e16b-46a2-b0c0-7124d594ffc9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_38eefe17-7cf7-4082-a557-db4894881437" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_38eefe17-7cf7-4082-a557-db4894881437" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_874a864a-bd88-4113-9c5b-1dc8ad642d21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_874a864a-bd88-4113-9c5b-1dc8ad642d21" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_2ec3d9cf-8591-4200-b0ee-a65bc4c5b926" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_us-gaap_InterestExpenseDebt_2ec3d9cf-8591-4200-b0ee-a65bc4c5b926" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_678625c9-d95e-4d98-b66d-965b49c0ae4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_us-gaap_InterestPaidNet_678625c9-d95e-4d98-b66d-965b49c0ae4f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfDebtDiscountPremium_49ac4913-ddec-441a-b2e6-16f7bdd3ba24" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfDebtDiscountPremium"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_us-gaap_AmortizationOfDebtDiscountPremium_49ac4913-ddec-441a-b2e6-16f7bdd3ba24" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfDebt_d1a857a5-e6c1-4293-8b4c-5c44af7be5a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_us-gaap_RepaymentsOfDebt_d1a857a5-e6c1-4293-8b4c-5c44af7be5a4" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedPremium_81089428-f7ff-400e-b958-39dcbed2e55b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentUnamortizedPremium"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedPremium_81089428-f7ff-400e-b958-39dcbed2e55b" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction_d33411c9-4a6f-43f8-8b8d-08647ba24705" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_us-gaap_DebtIssuanceCostsIncurredDuringNoncashOrPartialNoncashTransaction_d33411c9-4a6f-43f8-8b8d-08647ba24705" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_f4a693e3-54bc-42af-b788-0d8865ae1b02" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_f4a693e3-54bc-42af-b788-0d8865ae1b02" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPayableCurrentAndNoncurrent_ab23d3f7-0b18-41d3-b03f-e6b2301815ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestPayableCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_us-gaap_InterestPayableCurrentAndNoncurrent_ab23d3f7-0b18-41d3-b03f-e6b2301815ef" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_95930792-b054-46e3-8e6a-b5c25db722c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_95930792-b054-46e3-8e6a-b5c25db722c6" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_a82bce99-b0eb-4037-8290-3218241adfae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_a82bce99-b0eb-4037-8290-3218241adfae" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_DebtInstrumentSharesIssuedSettlementOfDebtIssuanceCosts_46879590-cd21-46c1-b8d3-418d528850df" xlink:href="soun-20250930.xsd#soun_DebtInstrumentSharesIssuedSettlementOfDebtIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_soun_DebtInstrumentSharesIssuedSettlementOfDebtIssuanceCosts_46879590-cd21-46c1-b8d3-418d528850df" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_694d62d3-35da-4b5d-b3d1-43ef384575df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_us-gaap_LongTermDebt_694d62d3-35da-4b5d-b3d1-43ef384575df" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_DebtInstrumentCovenantDefaultAdditionalAnnualIncreasePercent_2d95fc5d-d661-4fa3-95cb-5b63dcd66461" xlink:href="soun-20250930.xsd#soun_DebtInstrumentCovenantDefaultAdditionalAnnualIncreasePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_soun_DebtInstrumentCovenantDefaultAdditionalAnnualIncreasePercent_2d95fc5d-d661-4fa3-95cb-5b63dcd66461" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_b7412871-3681-4bb8-960f-5432426c7871" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestPaidNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaidInKindInterest_93ef382b-bc3e-4262-aada-edba4e25a353" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaidInKindInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_us-gaap_PaidInKindInterest_93ef382b-bc3e-4262-aada-edba4e25a353" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtExtinguishmentCosts_4e96d8de-c569-44b1-9ab2-c70ce42e8858" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfDebtExtinguishmentCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a8e9249f-f8af-45f9-a978-b20d6ad2f90a" xlink:to="loc_us-gaap_PaymentsOfDebtExtinguishmentCosts_4e96d8de-c569-44b1-9ab2-c70ce42e8858" xlink:type="arc" order="22"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/PREFERREDSTOCKDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#PREFERREDSTOCKDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/PREFERREDSTOCKDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredUnitsLineItems_93851122-7c2d-4b63-a34f-5da0e4c7d011" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredUnitsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPreferredUnitsTable_d24a33ca-7771-4613-91b0-527869e13b7e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfPreferredUnitsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PreferredUnitsLineItems_93851122-7c2d-4b63-a34f-5da0e4c7d011" xlink:to="loc_us-gaap_ScheduleOfPreferredUnitsTable_d24a33ca-7771-4613-91b0-527869e13b7e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_89c591c4-306d-4e48-ac77-3fac940e2e8e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPreferredUnitsTable_d24a33ca-7771-4613-91b0-527869e13b7e" xlink:to="loc_us-gaap_StatementClassOfStockAxis_89c591c4-306d-4e48-ac77-3fac940e2e8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_89c591c4-306d-4e48-ac77-3fac940e2e8e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_89c591c4-306d-4e48-ac77-3fac940e2e8e" xlink:to="loc_us-gaap_ClassOfStockDomain_89c591c4-306d-4e48-ac77-3fac940e2e8e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_572f802a-1f55-497f-9684-178b9bfd1358" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_89c591c4-306d-4e48-ac77-3fac940e2e8e" xlink:to="loc_us-gaap_ClassOfStockDomain_572f802a-1f55-497f-9684-178b9bfd1358" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesAPreferredStockMember_35231d45-0a79-41c7-8ed6-127888c96089" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeriesAPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_572f802a-1f55-497f-9684-178b9bfd1358" xlink:to="loc_us-gaap_SeriesAPreferredStockMember_35231d45-0a79-41c7-8ed6-127888c96089" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_efa1d90c-6ac4-495a-adac-5a771fbf0c43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_572f802a-1f55-497f-9684-178b9bfd1358" xlink:to="loc_us-gaap_PreferredStockMember_efa1d90c-6ac4-495a-adac-5a771fbf0c43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_e6aa755c-498c-46d3-a10e-35322fb66516" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_572f802a-1f55-497f-9684-178b9bfd1358" xlink:to="loc_us-gaap_CommonClassAMember_e6aa755c-498c-46d3-a10e-35322fb66516" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_463249a8-7aa0-412c-bb4c-39c383cba6a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PreferredUnitsLineItems_93851122-7c2d-4b63-a34f-5da0e4c7d011" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_463249a8-7aa0-412c-bb4c-39c383cba6a2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_a009afb7-50eb-4b82-91d4-ca17bd6bf080" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PreferredUnitsLineItems_93851122-7c2d-4b63-a34f-5da0e4c7d011" xlink:to="loc_us-gaap_SaleOfStockPricePerShare_a009afb7-50eb-4b82-91d4-ca17bd6bf080" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_772282dd-dc56-40ae-8fa4-a27d211f5cbf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockConsiderationReceivedOnTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PreferredUnitsLineItems_93851122-7c2d-4b63-a34f-5da0e4c7d011" xlink:to="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_772282dd-dc56-40ae-8fa4-a27d211f5cbf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockLiquidationPreference_36d0b641-bcfa-4214-90e2-f3fab754a8eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockLiquidationPreference"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PreferredUnitsLineItems_93851122-7c2d-4b63-a34f-5da0e4c7d011" xlink:to="loc_us-gaap_PreferredStockLiquidationPreference_36d0b641-bcfa-4214-90e2-f3fab754a8eb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockConvertibleConversionPrice_9fee5b77-3b38-40b9-b562-12cebfa62907" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockConvertibleConversionPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PreferredUnitsLineItems_93851122-7c2d-4b63-a34f-5da0e4c7d011" xlink:to="loc_us-gaap_PreferredStockConvertibleConversionPrice_9fee5b77-3b38-40b9-b562-12cebfa62907" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_CommonStockConvertibleConversionPriceRatio_aeaba6cc-5ae3-4f80-bbee-322d4282895e" xlink:href="soun-20250930.xsd#soun_CommonStockConvertibleConversionPriceRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PreferredUnitsLineItems_93851122-7c2d-4b63-a34f-5da0e4c7d011" xlink:to="loc_soun_CommonStockConvertibleConversionPriceRatio_aeaba6cc-5ae3-4f80-bbee-322d4282895e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_PreferredStockConvertibleThresholdTradingDays_b8b49bd1-2089-4ea1-94b5-31e2f8c4ef5c" xlink:href="soun-20250930.xsd#soun_PreferredStockConvertibleThresholdTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PreferredUnitsLineItems_93851122-7c2d-4b63-a34f-5da0e4c7d011" xlink:to="loc_soun_PreferredStockConvertibleThresholdTradingDays_b8b49bd1-2089-4ea1-94b5-31e2f8c4ef5c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_PreferredStockConvertibleThresholdConsecutiveTradingDays_7f58c77a-4b87-4b48-92d1-bd67b15a4aa9" xlink:href="soun-20250930.xsd#soun_PreferredStockConvertibleThresholdConsecutiveTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PreferredUnitsLineItems_93851122-7c2d-4b63-a34f-5da0e4c7d011" xlink:to="loc_soun_PreferredStockConvertibleThresholdConsecutiveTradingDays_7f58c77a-4b87-4b48-92d1-bd67b15a4aa9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockSharesConverted1_8f35e61b-7ec8-4501-b0d2-d60807cb2e70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConversionOfStockSharesConverted1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PreferredUnitsLineItems_93851122-7c2d-4b63-a34f-5da0e4c7d011" xlink:to="loc_us-gaap_ConversionOfStockSharesConverted1_8f35e61b-7ec8-4501-b0d2-d60807cb2e70" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockSharesIssued1_d43c4091-cc94-4570-9017-47b63b33e925" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConversionOfStockSharesIssued1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PreferredUnitsLineItems_93851122-7c2d-4b63-a34f-5da0e4c7d011" xlink:to="loc_us-gaap_ConversionOfStockSharesIssued1_d43c4091-cc94-4570-9017-47b63b33e925" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_GainLossOnStockConversion_f90cf0a4-1f96-492f-85e3-cb9348a0b242" xlink:href="soun-20250930.xsd#soun_GainLossOnStockConversion"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PreferredUnitsLineItems_93851122-7c2d-4b63-a34f-5da0e4c7d011" xlink:to="loc_soun_GainLossOnStockConversion_f90cf0a4-1f96-492f-85e3-cb9348a0b242" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/COMMONSTOCKDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#COMMONSTOCKDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/COMMONSTOCKDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_a5264566-93cd-46c1-875f-7e2ddb2ae5e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_270236f0-07e2-4a74-af0f-d0f84d3fd06c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5264566-93cd-46c1-875f-7e2ddb2ae5e8" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_270236f0-07e2-4a74-af0f-d0f84d3fd06c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_4268b7cd-57f1-44fc-ace2-515d55f46654" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_270236f0-07e2-4a74-af0f-d0f84d3fd06c" xlink:to="loc_us-gaap_StatementClassOfStockAxis_4268b7cd-57f1-44fc-ace2-515d55f46654" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_4268b7cd-57f1-44fc-ace2-515d55f46654_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_4268b7cd-57f1-44fc-ace2-515d55f46654" xlink:to="loc_us-gaap_ClassOfStockDomain_4268b7cd-57f1-44fc-ace2-515d55f46654_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_13cc0328-3660-4d94-aef7-67cfd4b6bc86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_4268b7cd-57f1-44fc-ace2-515d55f46654" xlink:to="loc_us-gaap_ClassOfStockDomain_13cc0328-3660-4d94-aef7-67cfd4b6bc86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_50f1b10b-3f72-494b-8ada-7426c2d82b85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_13cc0328-3660-4d94-aef7-67cfd4b6bc86" xlink:to="loc_us-gaap_CommonClassAMember_50f1b10b-3f72-494b-8ada-7426c2d82b85" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_4d7e5454-2844-4543-bcc9-6e4b9cc32991" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_13cc0328-3660-4d94-aef7-67cfd4b6bc86" xlink:to="loc_us-gaap_CommonClassBMember_4d7e5454-2844-4543-bcc9-6e4b9cc32991" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_3988fcdc-1007-4b46-a833-f8cb2c7ff1ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_270236f0-07e2-4a74-af0f-d0f84d3fd06c" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_3988fcdc-1007-4b46-a833-f8cb2c7ff1ec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_3988fcdc-1007-4b46-a833-f8cb2c7ff1ec_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_3988fcdc-1007-4b46-a833-f8cb2c7ff1ec" xlink:to="loc_us-gaap_EquityComponentDomain_3988fcdc-1007-4b46-a833-f8cb2c7ff1ec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_5a723867-6f3d-4b7a-890a-e3805cb6837a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_3988fcdc-1007-4b46-a833-f8cb2c7ff1ec" xlink:to="loc_us-gaap_EquityComponentDomain_5a723867-6f3d-4b7a-890a-e3805cb6837a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_42789218-a048-46de-9744-0e0fec51b8d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_5a723867-6f3d-4b7a-890a-e3805cb6837a" xlink:to="loc_us-gaap_CommonStockMember_42789218-a048-46de-9744-0e0fec51b8d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_d154d9a3-4ad2-45c5-8612-86c1ddcf52ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_270236f0-07e2-4a74-af0f-d0f84d3fd06c" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_d154d9a3-4ad2-45c5-8612-86c1ddcf52ff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_d154d9a3-4ad2-45c5-8612-86c1ddcf52ff_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_d154d9a3-4ad2-45c5-8612-86c1ddcf52ff" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_d154d9a3-4ad2-45c5-8612-86c1ddcf52ff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_a8103c93-18e6-4f53-a79f-c689025c4744" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_d154d9a3-4ad2-45c5-8612-86c1ddcf52ff" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_a8103c93-18e6-4f53-a79f-c689025c4744" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ControlledEquityOfferingSalesAgreementMember_30ce8591-5894-4c33-b4d8-6899e8a8a89d" xlink:href="soun-20250930.xsd#soun_ControlledEquityOfferingSalesAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_a8103c93-18e6-4f53-a79f-c689025c4744" xlink:to="loc_soun_ControlledEquityOfferingSalesAgreementMember_30ce8591-5894-4c33-b4d8-6899e8a8a89d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SalesAgreementIssuanceMember_d83be99e-2924-4208-bced-898295c51d86" xlink:href="soun-20250930.xsd#soun_SalesAgreementIssuanceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_a8103c93-18e6-4f53-a79f-c689025c4744" xlink:to="loc_soun_SalesAgreementIssuanceMember_d83be99e-2924-4208-bced-898295c51d86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_EquityDistributionAgreementMember_83d48607-abf7-45dc-97ca-d3aa93d6b0ec" xlink:href="soun-20250930.xsd#soun_EquityDistributionAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_a8103c93-18e6-4f53-a79f-c689025c4744" xlink:to="loc_soun_EquityDistributionAgreementMember_83d48607-abf7-45dc-97ca-d3aa93d6b0ec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ExecuteEquityDistributionAgreementMember_3d7af19c-c870-4092-a04c-5edbbf8ed170" xlink:href="soun-20250930.xsd#soun_ExecuteEquityDistributionAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_a8103c93-18e6-4f53-a79f-c689025c4744" xlink:to="loc_soun_ExecuteEquityDistributionAgreementMember_3d7af19c-c870-4092-a04c-5edbbf8ed170" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SecondEquityDistributionAgreementMember_b08aad79-dec7-40ad-b8de-a58a51838e0c" xlink:href="soun-20250930.xsd#soun_SecondEquityDistributionAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_a8103c93-18e6-4f53-a79f-c689025c4744" xlink:to="loc_soun_SecondEquityDistributionAgreementMember_b08aad79-dec7-40ad-b8de-a58a51838e0c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_7cb468b0-88c2-4bee-9e48-c95121358361" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5264566-93cd-46c1-875f-7e2ddb2ae5e8" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_7cb468b0-88c2-4bee-9e48-c95121358361" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_CommonStockAndPreferredStockSharesAuthorized_64703901-6225-4928-bffd-f9778d6d1288" xlink:href="soun-20250930.xsd#soun_CommonStockAndPreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5264566-93cd-46c1-875f-7e2ddb2ae5e8" xlink:to="loc_soun_CommonStockAndPreferredStockSharesAuthorized_64703901-6225-4928-bffd-f9778d6d1288" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_bdcf9ec4-ddfc-4294-8ed6-0b7fb22dc659" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5264566-93cd-46c1-875f-7e2ddb2ae5e8" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_bdcf9ec4-ddfc-4294-8ed6-0b7fb22dc659" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_d6062f14-247c-480c-99e3-e63f54fb74f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5264566-93cd-46c1-875f-7e2ddb2ae5e8" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_d6062f14-247c-480c-99e3-e63f54fb74f8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_1c7694f3-60a3-45e8-bef6-99fc6fcd7596" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5264566-93cd-46c1-875f-7e2ddb2ae5e8" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_1c7694f3-60a3-45e8-bef6-99fc6fcd7596" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_NumberOfVotesAllocatedToEachShare_54366390-dcd7-4caa-ba7d-895dd03fc9a6" xlink:href="soun-20250930.xsd#soun_NumberOfVotesAllocatedToEachShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5264566-93cd-46c1-875f-7e2ddb2ae5e8" xlink:to="loc_soun_NumberOfVotesAllocatedToEachShare_54366390-dcd7-4caa-ba7d-895dd03fc9a6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_CommonStockConvertibleConversionRatio_b4d19c50-99fc-4f9f-8179-029e4976a83f" xlink:href="soun-20250930.xsd#soun_CommonStockConvertibleConversionRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5264566-93cd-46c1-875f-7e2ddb2ae5e8" xlink:to="loc_soun_CommonStockConvertibleConversionRatio_b4d19c50-99fc-4f9f-8179-029e4976a83f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockSharesConverted1_953032ce-eb5c-4955-99f3-19716955cbe5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConversionOfStockSharesConverted1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5264566-93cd-46c1-875f-7e2ddb2ae5e8" xlink:to="loc_us-gaap_ConversionOfStockSharesConverted1_953032ce-eb5c-4955-99f3-19716955cbe5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SaleOfStockSharesOfStockAuthorizedToBeOfferedAndSold_9064f75a-038e-4b36-a491-bd895b3600d1" xlink:href="soun-20250930.xsd#soun_SaleOfStockSharesOfStockAuthorizedToBeOfferedAndSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5264566-93cd-46c1-875f-7e2ddb2ae5e8" xlink:to="loc_soun_SaleOfStockSharesOfStockAuthorizedToBeOfferedAndSold_9064f75a-038e-4b36-a491-bd895b3600d1" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SaleOfStockFixedCommissionRate_6202a9a1-b94a-42c2-8393-a39349cd2832" xlink:href="soun-20250930.xsd#soun_SaleOfStockFixedCommissionRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5264566-93cd-46c1-875f-7e2ddb2ae5e8" xlink:to="loc_soun_SaleOfStockFixedCommissionRate_6202a9a1-b94a-42c2-8393-a39349cd2832" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SaleOfStockReimbursableExpenses_84bdab26-8e2c-401f-be66-15a81c5e3a8c" xlink:href="soun-20250930.xsd#soun_SaleOfStockReimbursableExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5264566-93cd-46c1-875f-7e2ddb2ae5e8" xlink:to="loc_soun_SaleOfStockReimbursableExpenses_84bdab26-8e2c-401f-be66-15a81c5e3a8c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_6b04c8ca-95ce-4a25-8a18-d91757a973f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5264566-93cd-46c1-875f-7e2ddb2ae5e8" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_6b04c8ca-95ce-4a25-8a18-d91757a973f6" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_87120152-0a4f-4aaf-b055-304dd938ed54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5264566-93cd-46c1-875f-7e2ddb2ae5e8" xlink:to="loc_us-gaap_SaleOfStockPricePerShare_87120152-0a4f-4aaf-b055-304dd938ed54" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_9d407156-a6c5-4a50-b331-016f8500427a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5264566-93cd-46c1-875f-7e2ddb2ae5e8" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_9d407156-a6c5-4a50-b331-016f8500427a" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfStockIssuanceCosts_04105511-d7f7-4423-aa38-f9aea2db4b1b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfStockIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5264566-93cd-46c1-875f-7e2ddb2ae5e8" xlink:to="loc_us-gaap_PaymentsOfStockIssuanceCosts_04105511-d7f7-4423-aa38-f9aea2db4b1b" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_36709456-d095-43b2-a717-43d9c0a7e11a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockConsiderationReceivedOnTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5264566-93cd-46c1-875f-7e2ddb2ae5e8" xlink:to="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_36709456-d095-43b2-a717-43d9c0a7e11a" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SaleOfStockAverageStockPrice_80122af7-006f-48a7-88b3-432b93f8328e" xlink:href="soun-20250930.xsd#soun_SaleOfStockAverageStockPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5264566-93cd-46c1-875f-7e2ddb2ae5e8" xlink:to="loc_soun_SaleOfStockAverageStockPrice_80122af7-006f-48a7-88b3-432b93f8328e" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SaleOfStockRemainingCapacityAvailableForIssuance_3099f238-8859-40a6-a948-a90febe06bb6" xlink:href="soun-20250930.xsd#soun_SaleOfStockRemainingCapacityAvailableForIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5264566-93cd-46c1-875f-7e2ddb2ae5e8" xlink:to="loc_soun_SaleOfStockRemainingCapacityAvailableForIssuance_3099f238-8859-40a6-a948-a90febe06bb6" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_e4f211fe-ce8d-4e67-ba6b-0fd6ccafef57" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_a5264566-93cd-46c1-875f-7e2ddb2ae5e8" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_e4f211fe-ce8d-4e67-ba6b-0fd6ccafef57" xlink:type="arc" order="18"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/STOCKINCENTIVEPLANSNarrativesDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#STOCKINCENTIVEPLANSNarrativesDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/STOCKINCENTIVEPLANSNarrativesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_995f6cf9-3f5b-46f0-a530-9f1eed668767" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_995f6cf9-3f5b-46f0-a530-9f1eed668767" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_836cb22f-b2ba-4c54-8776-9fb0263fd894" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_995f6cf9-3f5b-46f0-a530-9f1eed668767" xlink:to="loc_us-gaap_PlanNameAxis_836cb22f-b2ba-4c54-8776-9fb0263fd894" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_836cb22f-b2ba-4c54-8776-9fb0263fd894_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_836cb22f-b2ba-4c54-8776-9fb0263fd894" xlink:to="loc_us-gaap_PlanNameDomain_836cb22f-b2ba-4c54-8776-9fb0263fd894_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_d49a208b-5519-4c9d-99e5-81bbbf0becd1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_836cb22f-b2ba-4c54-8776-9fb0263fd894" xlink:to="loc_us-gaap_PlanNameDomain_d49a208b-5519-4c9d-99e5-81bbbf0becd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_TwoThousandSixteenEquityIncentivePlanMember_f8bdb257-5702-4ea0-a5ce-404aba313329" xlink:href="soun-20250930.xsd#soun_TwoThousandSixteenEquityIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_d49a208b-5519-4c9d-99e5-81bbbf0becd1" xlink:to="loc_soun_TwoThousandSixteenEquityIncentivePlanMember_f8bdb257-5702-4ea0-a5ce-404aba313329" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_TwoThousandTwentyTwoIncentivePlanMember_af11355e-a446-480c-910a-635ac497ec7c" xlink:href="soun-20250930.xsd#soun_TwoThousandTwentyTwoIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_d49a208b-5519-4c9d-99e5-81bbbf0becd1" xlink:to="loc_soun_TwoThousandTwentyTwoIncentivePlanMember_af11355e-a446-480c-910a-635ac497ec7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_TwoThousandTwentyTwoEmployeeStockPurchasePlanMember_525e1490-ff8a-4993-9eae-54cb0651c6c3" xlink:href="soun-20250930.xsd#soun_TwoThousandTwentyTwoEmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_d49a208b-5519-4c9d-99e5-81bbbf0becd1" xlink:to="loc_soun_TwoThousandTwentyTwoEmployeeStockPurchasePlanMember_525e1490-ff8a-4993-9eae-54cb0651c6c3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_A2024EmploymentInducementIncentiveAwardPlanMember_2d213e46-e47c-46bf-a46c-0930e7a6c036" xlink:href="soun-20250930.xsd#soun_A2024EmploymentInducementIncentiveAwardPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_d49a208b-5519-4c9d-99e5-81bbbf0becd1" xlink:to="loc_soun_A2024EmploymentInducementIncentiveAwardPlanMember_2d213e46-e47c-46bf-a46c-0930e7a6c036" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_eb910280-ca21-4810-a68e-a6a568cfbdc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_995f6cf9-3f5b-46f0-a530-9f1eed668767" xlink:to="loc_us-gaap_StatementClassOfStockAxis_eb910280-ca21-4810-a68e-a6a568cfbdc4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_eb910280-ca21-4810-a68e-a6a568cfbdc4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_eb910280-ca21-4810-a68e-a6a568cfbdc4" xlink:to="loc_us-gaap_ClassOfStockDomain_eb910280-ca21-4810-a68e-a6a568cfbdc4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_1d23570a-6b96-4c70-be27-46a98e2bd518" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_eb910280-ca21-4810-a68e-a6a568cfbdc4" xlink:to="loc_us-gaap_ClassOfStockDomain_1d23570a-6b96-4c70-be27-46a98e2bd518" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_8ebdb665-9061-4d59-a28e-e8a05d1dfa2d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_1d23570a-6b96-4c70-be27-46a98e2bd518" xlink:to="loc_us-gaap_CommonClassAMember_8ebdb665-9061-4d59-a28e-e8a05d1dfa2d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_ce26eb0c-86a8-49b0-99c0-626965ca6efb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_995f6cf9-3f5b-46f0-a530-9f1eed668767" xlink:to="loc_us-gaap_AwardTypeAxis_ce26eb0c-86a8-49b0-99c0-626965ca6efb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ce26eb0c-86a8-49b0-99c0-626965ca6efb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_ce26eb0c-86a8-49b0-99c0-626965ca6efb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ce26eb0c-86a8-49b0-99c0-626965ca6efb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3af15609-d240-4a39-a8aa-57eb5664f025" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_ce26eb0c-86a8-49b0-99c0-626965ca6efb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3af15609-d240-4a39-a8aa-57eb5664f025" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_49ce1f1e-e7ee-42dc-8f85-dc1472f805b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3af15609-d240-4a39-a8aa-57eb5664f025" xlink:to="loc_us-gaap_EmployeeStockOptionMember_49ce1f1e-e7ee-42dc-8f85-dc1472f805b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_f24fd670-3643-49d3-a089-442b140de6c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3af15609-d240-4a39-a8aa-57eb5664f025" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_f24fd670-3643-49d3-a089-442b140de6c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MarketBasedRestrictedStockUnitsMember_cde09932-e967-4cf2-840f-a58cae5d7abc" xlink:href="soun-20250930.xsd#soun_MarketBasedRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3af15609-d240-4a39-a8aa-57eb5664f025" xlink:to="loc_soun_MarketBasedRestrictedStockUnitsMember_cde09932-e967-4cf2-840f-a58cae5d7abc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_d48b4061-fe2a-4ac8-a42b-5781a71d9cc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3af15609-d240-4a39-a8aa-57eb5664f025" xlink:to="loc_us-gaap_PerformanceSharesMember_d48b4061-fe2a-4ac8-a42b-5781a71d9cc4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_6023e5b4-7342-443d-9161-4e81347a95d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3af15609-d240-4a39-a8aa-57eb5664f025" xlink:to="loc_us-gaap_RestrictedStockMember_6023e5b4-7342-443d-9161-4e81347a95d6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_24700d6b-3e00-4830-984e-13cbb80c5c41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_995f6cf9-3f5b-46f0-a530-9f1eed668767" xlink:to="loc_us-gaap_VestingAxis_24700d6b-3e00-4830-984e-13cbb80c5c41" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_24700d6b-3e00-4830-984e-13cbb80c5c41_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_24700d6b-3e00-4830-984e-13cbb80c5c41" xlink:to="loc_us-gaap_VestingDomain_24700d6b-3e00-4830-984e-13cbb80c5c41_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_76970464-5740-47cb-bf56-5bcf75e1423b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_24700d6b-3e00-4830-984e-13cbb80c5c41" xlink:to="loc_us-gaap_VestingDomain_76970464-5740-47cb-bf56-5bcf75e1423b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_0609d591-b4f1-46a0-b777-30f0a967f4f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationAwardTrancheOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_76970464-5740-47cb-bf56-5bcf75e1423b" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_0609d591-b4f1-46a0-b777-30f0a967f4f6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_fd94a47a-e63c-40b1-abee-371742c19d54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_76970464-5740-47cb-bf56-5bcf75e1423b" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_fd94a47a-e63c-40b1-abee-371742c19d54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_6bbc8406-5a83-4703-bf5b-9b163af0b743" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationAwardTrancheThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_76970464-5740-47cb-bf56-5bcf75e1423b" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_6bbc8406-5a83-4703-bf5b-9b163af0b743" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_3cd449b6-ae13-40b5-8fbe-590aa5868146" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_995f6cf9-3f5b-46f0-a530-9f1eed668767" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_3cd449b6-ae13-40b5-8fbe-590aa5868146" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3cd449b6-ae13-40b5-8fbe-590aa5868146_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_3cd449b6-ae13-40b5-8fbe-590aa5868146" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3cd449b6-ae13-40b5-8fbe-590aa5868146_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_58bb1db2-7c40-45db-9ac3-b67c932c0e7a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_3cd449b6-ae13-40b5-8fbe-590aa5868146" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_58bb1db2-7c40-45db-9ac3-b67c932c0e7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_Synq3IncMember_ad8ea1ab-847c-489c-a283-f7604eb189eb" xlink:href="soun-20250930.xsd#soun_Synq3IncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_58bb1db2-7c40-45db-9ac3-b67c932c0e7a" xlink:to="loc_soun_Synq3IncMember_ad8ea1ab-847c-489c-a283-f7604eb189eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_22b3f73a-c3aa-4491-8d09-a30fdd127979" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_995f6cf9-3f5b-46f0-a530-9f1eed668767" xlink:to="loc_srt_StatementScenarioAxis_22b3f73a-c3aa-4491-8d09-a30fdd127979" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_22b3f73a-c3aa-4491-8d09-a30fdd127979_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_22b3f73a-c3aa-4491-8d09-a30fdd127979" xlink:to="loc_srt_ScenarioUnspecifiedDomain_22b3f73a-c3aa-4491-8d09-a30fdd127979_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_a4d039e3-fbd5-49a5-a3fc-b9086548c758" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_22b3f73a-c3aa-4491-8d09-a30fdd127979" xlink:to="loc_srt_ScenarioUnspecifiedDomain_a4d039e3-fbd5-49a5-a3fc-b9086548c758" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_3df9c443-5e19-4765-a5a1-350b49d5200c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_a4d039e3-fbd5-49a5-a3fc-b9086548c758" xlink:to="loc_srt_ScenarioForecastMember_3df9c443-5e19-4765-a5a1-350b49d5200c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_08f45b2c-a43a-4d8f-bd40-beed46696a3c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_995f6cf9-3f5b-46f0-a530-9f1eed668767" xlink:to="loc_srt_RangeAxis_08f45b2c-a43a-4d8f-bd40-beed46696a3c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_08f45b2c-a43a-4d8f-bd40-beed46696a3c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_08f45b2c-a43a-4d8f-bd40-beed46696a3c" xlink:to="loc_srt_RangeMember_08f45b2c-a43a-4d8f-bd40-beed46696a3c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_27ac7881-929e-437f-bf34-746cc749f23e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_08f45b2c-a43a-4d8f-bd40-beed46696a3c" xlink:to="loc_srt_RangeMember_27ac7881-929e-437f-bf34-746cc749f23e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_530ff174-3569-4f8e-baa7-fa49594170bd" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_27ac7881-929e-437f-bf34-746cc749f23e" xlink:to="loc_srt_MinimumMember_530ff174-3569-4f8e-baa7-fa49594170bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_667ac42c-291f-4d7b-844b-5c3595cb9787" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_27ac7881-929e-437f-bf34-746cc749f23e" xlink:to="loc_srt_MaximumMember_667ac42c-291f-4d7b-844b-5c3595cb9787" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusAxis_d1fa705b-1f03-459e-9ffa-92934c476dea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GranteeStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_995f6cf9-3f5b-46f0-a530-9f1eed668767" xlink:to="loc_us-gaap_GranteeStatusAxis_d1fa705b-1f03-459e-9ffa-92934c476dea" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_d1fa705b-1f03-459e-9ffa-92934c476dea_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GranteeStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GranteeStatusAxis_d1fa705b-1f03-459e-9ffa-92934c476dea" xlink:to="loc_us-gaap_GranteeStatusDomain_d1fa705b-1f03-459e-9ffa-92934c476dea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_97022a36-be79-4283-8903-8980039f7343" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GranteeStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GranteeStatusAxis_d1fa705b-1f03-459e-9ffa-92934c476dea" xlink:to="loc_us-gaap_GranteeStatusDomain_97022a36-be79-4283-8903-8980039f7343" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_GranteeStatusSYNQ3EmployeesMember_874d3a68-00f5-4901-9aeb-80fcb8e9f47f" xlink:href="soun-20250930.xsd#soun_GranteeStatusSYNQ3EmployeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GranteeStatusDomain_97022a36-be79-4283-8903-8980039f7343" xlink:to="loc_soun_GranteeStatusSYNQ3EmployeesMember_874d3a68-00f5-4901-9aeb-80fcb8e9f47f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedPaymentArrangementEmployeeMember_73a251f9-27ef-4e60-8d24-b4c63ac4c39e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedPaymentArrangementEmployeeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GranteeStatusDomain_97022a36-be79-4283-8903-8980039f7343" xlink:to="loc_us-gaap_ShareBasedPaymentArrangementEmployeeMember_73a251f9-27ef-4e60-8d24-b4c63ac4c39e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_18c29902-d0ba-4004-b2d1-74b9c2b36312" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_18c29902-d0ba-4004-b2d1-74b9c2b36312" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_f6e10999-85cf-4baf-b5c3-8babe19bc3c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_f6e10999-85cf-4baf-b5c3-8babe19bc3c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum_2bcc61aa-d623-487e-9bb6-e9472a8c4cbb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum_2bcc61aa-d623-487e-9bb6-e9472a8c4cbb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_EmployeeStockPurchasePlanSharesReservedForIssuancePeriodSubjectToIncrease_cb462520-f815-4687-8e67-ead6a915ded7" xlink:href="soun-20250930.xsd#soun_EmployeeStockPurchasePlanSharesReservedForIssuancePeriodSubjectToIncrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_soun_EmployeeStockPurchasePlanSharesReservedForIssuancePeriodSubjectToIncrease_cb462520-f815-4687-8e67-ead6a915ded7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_9d720ad0-cad4-4edb-9462-c32a756eb3f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_9d720ad0-cad4-4edb-9462-c32a756eb3f7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_AggregateSharePercentageAsPercentageOfSharesOutstanding_54a2b957-5e13-4f1a-a9d4-2174573fb66a" xlink:href="soun-20250930.xsd#soun_AggregateSharePercentageAsPercentageOfSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_soun_AggregateSharePercentageAsPercentageOfSharesOutstanding_54a2b957-5e13-4f1a-a9d4-2174573fb66a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_EmployeeStockPurchasePlanAggregateNumberIncrementalPeriod_50b70776-008f-4210-99d6-9b51ef170412" xlink:href="soun-20250930.xsd#soun_EmployeeStockPurchasePlanAggregateNumberIncrementalPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_soun_EmployeeStockPurchasePlanAggregateNumberIncrementalPeriod_50b70776-008f-4210-99d6-9b51ef170412" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_EmployeeStockPurchasePlanOfferingPeriod_5b52505c-6283-4d6f-bb2d-ffa20e9e8aad" xlink:href="soun-20250930.xsd#soun_EmployeeStockPurchasePlanOfferingPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_soun_EmployeeStockPurchasePlanOfferingPeriod_5b52505c-6283-4d6f-bb2d-ffa20e9e8aad" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_PercentageOfFairMarketValueAShare_47c2ddee-034f-48e1-a5ac-b1af6994a973" xlink:href="soun-20250930.xsd#soun_PercentageOfFairMarketValueAShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_soun_PercentageOfFairMarketValueAShare_47c2ddee-034f-48e1-a5ac-b1af6994a973" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_EmployeeStockPurchasePlanLookBackPeriod_ad017f3d-5e4f-4f46-be72-8bef2e2e38b2" xlink:href="soun-20250930.xsd#soun_EmployeeStockPurchasePlanLookBackPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_soun_EmployeeStockPurchasePlanLookBackPeriod_ad017f3d-5e4f-4f46-be72-8bef2e2e38b2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_770b9480-caed-4237-a7ad-cde1a63be195" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_770b9480-caed-4237-a7ad-cde1a63be195" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_8ee9fc4d-4676-402f-986e-b9f5c0a9c8dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_8ee9fc4d-4676-402f-986e-b9f5c0a9c8dd" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_e564cefa-3478-4b6e-b035-c78d8f4f38a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_e564cefa-3478-4b6e-b035-c78d8f4f38a4" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_7b4ae873-7c93-4c11-9b37-ee58c0036a37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_7b4ae873-7c93-4c11-9b37-ee58c0036a37" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_69d1a9cb-a5c2-4f87-b1da-32cec6b89fa1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_69d1a9cb-a5c2-4f87-b1da-32cec6b89fa1" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_972fa4c7-10c6-4a7d-b3bd-b7ee1365fcb7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_972fa4c7-10c6-4a7d-b3bd-b7ee1365fcb7" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_8f3e4d13-6e17-4c22-b4f4-f73aa8b1e37a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_8f3e4d13-6e17-4c22-b4f4-f73aa8b1e37a" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_b4f1cce0-b800-42f2-8bf4-e697c9177045" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_b4f1cce0-b800-42f2-8bf4-e697c9177045" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsRevenueTarget_1d3a224d-25ea-4bad-b8e8-315aad1f1392" xlink:href="soun-20250930.xsd#soun_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsRevenueTarget"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_soun_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsRevenueTarget_1d3a224d-25ea-4bad-b8e8-315aad1f1392" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_d749f5d7-95fa-45c6-89fc-2c87669e2043" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_d749f5d7-95fa-45c6-89fc-2c87669e2043" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_03a0555e-e0da-4c7b-98d2-7543ba3bfe16" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_03a0555e-e0da-4c7b-98d2-7543ba3bfe16" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingNumberOfVestingTranches_1b8ab8e0-f12c-42ee-8984-793ed0285382" xlink:href="soun-20250930.xsd#soun_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingNumberOfVestingTranches"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_soun_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingNumberOfVestingTranches_1b8ab8e0-f12c-42ee-8984-793ed0285382" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares_db339046-f1e0-4de4-b5db-4cbc1173d10e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_50883c58-f09f-4cd2-93ce-b084cf85940a" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares_db339046-f1e0-4de4-b5db-4cbc1173d10e" xlink:type="arc" order="22"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/STOCKINCENTIVEPLANSScheduleofOperationsandComprehensiveLossDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#STOCKINCENTIVEPLANSScheduleofOperationsandComprehensiveLossDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/STOCKINCENTIVEPLANSScheduleofOperationsandComprehensiveLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_88a13cf3-a86f-4320-919f-9600bc01c140" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8331ca4b-078c-483d-bd70-cad9e6a87b86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_88a13cf3-a86f-4320-919f-9600bc01c140" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8331ca4b-078c-483d-bd70-cad9e6a87b86" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_9a30ee08-fe3c-45fb-b8b5-fc0bebf8f022" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8331ca4b-078c-483d-bd70-cad9e6a87b86" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_9a30ee08-fe3c-45fb-b8b5-fc0bebf8f022" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_9a30ee08-fe3c-45fb-b8b5-fc0bebf8f022_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_9a30ee08-fe3c-45fb-b8b5-fc0bebf8f022" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_9a30ee08-fe3c-45fb-b8b5-fc0bebf8f022_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_a8d990b4-313e-4433-9775-9f435551be55" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_9a30ee08-fe3c-45fb-b8b5-fc0bebf8f022" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_a8d990b4-313e-4433-9775-9f435551be55" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_22561d50-a41b-41a7-83d9-7c6269f01afd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_a8d990b4-313e-4433-9775-9f435551be55" xlink:to="loc_us-gaap_CostOfSalesMember_22561d50-a41b-41a7-83d9-7c6269f01afd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_7c42da9f-35aa-46cc-9251-caf8b4c3aa28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingAndMarketingExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_a8d990b4-313e-4433-9775-9f435551be55" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_7c42da9f-35aa-46cc-9251-caf8b4c3aa28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_458c7a38-171c-4d2a-b4a1-72251394c615" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_a8d990b4-313e-4433-9775-9f435551be55" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_458c7a38-171c-4d2a-b4a1-72251394c615" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_ff965aa8-daf1-4af1-acd0-d8fad8c285cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralAndAdministrativeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_a8d990b4-313e-4433-9775-9f435551be55" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_ff965aa8-daf1-4af1-acd0-d8fad8c285cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_584e7685-3b30-46cf-bd31-14f012739758" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_88a13cf3-a86f-4320-919f-9600bc01c140" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_584e7685-3b30-46cf-bd31-14f012739758" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/NETLOSSPERSHAREScheduleofOutstandingSharesofPotentiallyDilutiveSecuritiesDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#NETLOSSPERSHAREScheduleofOutstandingSharesofPotentiallyDilutiveSecuritiesDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/NETLOSSPERSHAREScheduleofOutstandingSharesofPotentiallyDilutiveSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_f70a8d9e-6cc5-47a6-8d41-7ad1f3251847" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_670b4887-1b5c-4aac-9cc3-281d6d18a5c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_f70a8d9e-6cc5-47a6-8d41-7ad1f3251847" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_670b4887-1b5c-4aac-9cc3-281d6d18a5c4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_61eb56d9-b199-4af5-844d-5bc7782154f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_670b4887-1b5c-4aac-9cc3-281d6d18a5c4" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_61eb56d9-b199-4af5-844d-5bc7782154f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_61eb56d9-b199-4af5-844d-5bc7782154f4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_61eb56d9-b199-4af5-844d-5bc7782154f4" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_61eb56d9-b199-4af5-844d-5bc7782154f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_79296e12-7710-4835-a252-9aa6938e26b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_61eb56d9-b199-4af5-844d-5bc7782154f4" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_79296e12-7710-4835-a252-9aa6938e26b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockCompensationPlanMember_a2a100ac-014d-44e6-b634-d3ae65a07a68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockCompensationPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_79296e12-7710-4835-a252-9aa6938e26b5" xlink:to="loc_us-gaap_StockCompensationPlanMember_a2a100ac-014d-44e6-b634-d3ae65a07a68" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_2b53de0c-5643-4a29-9f5b-0c39b3050330" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WarrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_79296e12-7710-4835-a252-9aa6938e26b5" xlink:to="loc_us-gaap_WarrantMember_2b53de0c-5643-4a29-9f5b-0c39b3050330" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_UnvestedRestrictedShareMember_dc89178b-3f11-40ac-b2f2-2b9372f7bddf" xlink:href="soun-20250930.xsd#soun_UnvestedRestrictedShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_79296e12-7710-4835-a252-9aa6938e26b5" xlink:to="loc_soun_UnvestedRestrictedShareMember_dc89178b-3f11-40ac-b2f2-2b9372f7bddf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_a4d88323-c0f3-421e-812e-f5aaf55b0cc9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_f70a8d9e-6cc5-47a6-8d41-7ad1f3251847" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_a4d88323-c0f3-421e-812e-f5aaf55b0cc9" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/NETLOSSPERSHARENarrativeDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#NETLOSSPERSHARENarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/NETLOSSPERSHARENarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_e3a2c9db-cdc5-40fa-ad32-8e9c16ea6f57" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_902f64b2-2ed0-407a-afd0-24f8de38248c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_e3a2c9db-cdc5-40fa-ad32-8e9c16ea6f57" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_902f64b2-2ed0-407a-afd0-24f8de38248c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_27880416-f316-4904-95a1-1ab155998751" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_902f64b2-2ed0-407a-afd0-24f8de38248c" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_27880416-f316-4904-95a1-1ab155998751" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_27880416-f316-4904-95a1-1ab155998751_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_27880416-f316-4904-95a1-1ab155998751" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_27880416-f316-4904-95a1-1ab155998751_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_da9e6f57-d8c3-4ba6-a7cd-b30da2702296" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_27880416-f316-4904-95a1-1ab155998751" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_da9e6f57-d8c3-4ba6-a7cd-b30da2702296" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_UnvestedStockBasedAwardsMember_435c4cd9-28ce-4caf-bdc3-b0bd6534cae0" xlink:href="soun-20250930.xsd#soun_UnvestedStockBasedAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_da9e6f57-d8c3-4ba6-a7cd-b30da2702296" xlink:to="loc_soun_UnvestedStockBasedAwardsMember_435c4cd9-28ce-4caf-bdc3-b0bd6534cae0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_8a200e64-0509-434f-820a-a5e7e47d4a1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_da9e6f57-d8c3-4ba6-a7cd-b30da2702296" xlink:to="loc_us-gaap_RestrictedStockMember_8a200e64-0509-434f-820a-a5e7e47d4a1f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentlyIssuableSharesEarnoutSharesMember_9e98472c-f093-44a8-a8d0-c8dcec6719dc" xlink:href="soun-20250930.xsd#soun_ContingentlyIssuableSharesEarnoutSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_da9e6f57-d8c3-4ba6-a7cd-b30da2702296" xlink:to="loc_soun_ContingentlyIssuableSharesEarnoutSharesMember_9e98472c-f093-44a8-a8d0-c8dcec6719dc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentlyIssuableSharesMember_e85fd0fc-6b66-4f6f-add5-cb877c25f260" xlink:href="soun-20250930.xsd#soun_ContingentlyIssuableSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_da9e6f57-d8c3-4ba6-a7cd-b30da2702296" xlink:to="loc_soun_ContingentlyIssuableSharesMember_e85fd0fc-6b66-4f6f-add5-cb877c25f260" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentlyReturnableSharesMember_20a9e699-b872-4c6d-a9a9-e9ed3909ccdb" xlink:href="soun-20250930.xsd#soun_ContingentlyReturnableSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_da9e6f57-d8c3-4ba6-a7cd-b30da2702296" xlink:to="loc_soun_ContingentlyReturnableSharesMember_20a9e699-b872-4c6d-a9a9-e9ed3909ccdb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_3716338f-0c57-4b3d-b95f-7e7bb88f4cc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_902f64b2-2ed0-407a-afd0-24f8de38248c" xlink:to="loc_us-gaap_StatementClassOfStockAxis_3716338f-0c57-4b3d-b95f-7e7bb88f4cc4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_3716338f-0c57-4b3d-b95f-7e7bb88f4cc4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_3716338f-0c57-4b3d-b95f-7e7bb88f4cc4" xlink:to="loc_us-gaap_ClassOfStockDomain_3716338f-0c57-4b3d-b95f-7e7bb88f4cc4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_f796b072-39b0-4552-901f-7c3c3934c87c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_3716338f-0c57-4b3d-b95f-7e7bb88f4cc4" xlink:to="loc_us-gaap_ClassOfStockDomain_f796b072-39b0-4552-901f-7c3c3934c87c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_5977386c-01ce-44e8-9b57-02daa286df48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_f796b072-39b0-4552-901f-7c3c3934c87c" xlink:to="loc_us-gaap_CommonClassAMember_5977386c-01ce-44e8-9b57-02daa286df48" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_7eee25ba-628a-4c13-813f-ecbde3857da3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_902f64b2-2ed0-407a-afd0-24f8de38248c" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_7eee25ba-628a-4c13-813f-ecbde3857da3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_7eee25ba-628a-4c13-813f-ecbde3857da3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_7eee25ba-628a-4c13-813f-ecbde3857da3" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_7eee25ba-628a-4c13-813f-ecbde3857da3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_b6a26039-c47d-418f-8e92-4590ab2c6d63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_7eee25ba-628a-4c13-813f-ecbde3857da3" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_b6a26039-c47d-418f-8e92-4590ab2c6d63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationHoldbackLiabilityMember_9c7c3b0d-6d89-4bad-a326-865a20d501f7" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationHoldbackLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_b6a26039-c47d-418f-8e92-4590ab2c6d63" xlink:to="loc_soun_ContingentConsiderationHoldbackLiabilityMember_9c7c3b0d-6d89-4bad-a326-865a20d501f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_EscrowConsiderationWithholdingMember_0c10c6e0-6425-43c9-becc-6d2350edd4c6" xlink:href="soun-20250930.xsd#soun_EscrowConsiderationWithholdingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_b6a26039-c47d-418f-8e92-4590ab2c6d63" xlink:to="loc_soun_EscrowConsiderationWithholdingMember_0c10c6e0-6425-43c9-becc-6d2350edd4c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_443d8305-31f9-43a4-b47b-a6f00a54b495" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_902f64b2-2ed0-407a-afd0-24f8de38248c" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_443d8305-31f9-43a4-b47b-a6f00a54b495" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_443d8305-31f9-43a4-b47b-a6f00a54b495_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_443d8305-31f9-43a4-b47b-a6f00a54b495" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_443d8305-31f9-43a4-b47b-a6f00a54b495_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4f5ae4e0-6ab0-4105-8558-2ccfc22386ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_443d8305-31f9-43a4-b47b-a6f00a54b495" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4f5ae4e0-6ab0-4105-8558-2ccfc22386ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_Synq3IncMember_efe48fa4-2788-4bab-948c-7c6bd3330287" xlink:href="soun-20250930.xsd#soun_Synq3IncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4f5ae4e0-6ab0-4105-8558-2ccfc22386ab" xlink:to="loc_soun_Synq3IncMember_efe48fa4-2788-4bab-948c-7c6bd3330287" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_690fab0a-cbfc-4642-be8f-9159448790d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_e3a2c9db-cdc5-40fa-ad32-8e9c16ea6f57" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_690fab0a-cbfc-4642-be8f-9159448790d5" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/FAIRVALUEMEASUREMENTSScheduleofFinancialInstrumentsMeasuredatFairValueDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#FAIRVALUEMEASUREMENTSScheduleofFinancialInstrumentsMeasuredatFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/FAIRVALUEMEASUREMENTSScheduleofFinancialInstrumentsMeasuredatFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_74355d56-38fb-4b7a-8071-9b0c7f15c8ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_39b8d3f4-d183-4c4b-a677-6fb6300f378b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_74355d56-38fb-4b7a-8071-9b0c7f15c8ad" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_39b8d3f4-d183-4c4b-a677-6fb6300f378b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_825c6c5b-3ee9-4bc1-a054-92910af2d535" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_39b8d3f4-d183-4c4b-a677-6fb6300f378b" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_825c6c5b-3ee9-4bc1-a054-92910af2d535" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_825c6c5b-3ee9-4bc1-a054-92910af2d535_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_825c6c5b-3ee9-4bc1-a054-92910af2d535" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_825c6c5b-3ee9-4bc1-a054-92910af2d535_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_7546d7dd-898f-4f5e-b9c8-4f29e4a77aaf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_825c6c5b-3ee9-4bc1-a054-92910af2d535" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_7546d7dd-898f-4f5e-b9c8-4f29e4a77aaf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_7d514168-9a38-4d74-9cbe-07026c0f41eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_7546d7dd-898f-4f5e-b9c8-4f29e4a77aaf" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_7d514168-9a38-4d74-9cbe-07026c0f41eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_58dc71bc-ce28-452d-a6f5-cbe43a4c31a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_39b8d3f4-d183-4c4b-a677-6fb6300f378b" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_58dc71bc-ce28-452d-a6f5-cbe43a4c31a4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_58dc71bc-ce28-452d-a6f5-cbe43a4c31a4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_58dc71bc-ce28-452d-a6f5-cbe43a4c31a4" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_58dc71bc-ce28-452d-a6f5-cbe43a4c31a4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_0996803e-96ad-4192-bc38-17f1b184fb95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_58dc71bc-ce28-452d-a6f5-cbe43a4c31a4" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_0996803e-96ad-4192-bc38-17f1b184fb95" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_7e4c2a4d-342b-4158-9978-73e87269a82c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_0996803e-96ad-4192-bc38-17f1b184fb95" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_7e4c2a4d-342b-4158-9978-73e87269a82c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_648e4f1e-f295-43e0-8f47-220bc3666c54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_0996803e-96ad-4192-bc38-17f1b184fb95" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_648e4f1e-f295-43e0-8f47-220bc3666c54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_3b168cdf-bb96-4359-b6c0-af1f6bab531e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_0996803e-96ad-4192-bc38-17f1b184fb95" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_3b168cdf-bb96-4359-b6c0-af1f6bab531e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAxis_75ac5c52-28dd-4678-8df0-144183cbcb70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_39b8d3f4-d183-4c4b-a677-6fb6300f378b" xlink:to="loc_us-gaap_CashAndCashEquivalentsAxis_75ac5c52-28dd-4678-8df0-144183cbcb70" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_75ac5c52-28dd-4678-8df0-144183cbcb70_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_75ac5c52-28dd-4678-8df0-144183cbcb70" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_75ac5c52-28dd-4678-8df0-144183cbcb70_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_f72d318a-e0de-437d-b2b9-d10864abc8ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_75ac5c52-28dd-4678-8df0-144183cbcb70" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_f72d318a-e0de-437d-b2b9-d10864abc8ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryBillSecuritiesMember_9de318bb-a603-4f47-b8cc-8dcc542b8fdb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USTreasuryBillSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_f72d318a-e0de-437d-b2b9-d10864abc8ae" xlink:to="loc_us-gaap_USTreasuryBillSecuritiesMember_9de318bb-a603-4f47-b8cc-8dcc542b8fdb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_73bf59a9-5cdd-46f2-969d-e4bdb9a1a387" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_f72d318a-e0de-437d-b2b9-d10864abc8ae" xlink:to="loc_us-gaap_MoneyMarketFundsMember_73bf59a9-5cdd-46f2-969d-e4bdb9a1a387" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_7383d2b6-3cc5-48ad-a508-94cb1d8d1121" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_39b8d3f4-d183-4c4b-a677-6fb6300f378b" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_7383d2b6-3cc5-48ad-a508-94cb1d8d1121" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_7383d2b6-3cc5-48ad-a508-94cb1d8d1121_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_7383d2b6-3cc5-48ad-a508-94cb1d8d1121" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_7383d2b6-3cc5-48ad-a508-94cb1d8d1121_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_7abcc65b-c9a6-4725-ae81-f57eb0aa1ae5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_7383d2b6-3cc5-48ad-a508-94cb1d8d1121" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_7abcc65b-c9a6-4725-ae81-f57eb0aa1ae5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationHoldbackLiabilityMember_f061fad5-c82d-4866-8b62-aeb1fedf3e27" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationHoldbackLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_7abcc65b-c9a6-4725-ae81-f57eb0aa1ae5" xlink:to="loc_soun_ContingentConsiderationHoldbackLiabilityMember_f061fad5-c82d-4866-8b62-aeb1fedf3e27" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationEarnoutLiabilityMember_5fb51b99-aa53-4f2a-8bde-2401c8f38b67" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationEarnoutLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_7abcc65b-c9a6-4725-ae81-f57eb0aa1ae5" xlink:to="loc_soun_ContingentConsiderationEarnoutLiabilityMember_5fb51b99-aa53-4f2a-8bde-2401c8f38b67" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_db3902f6-08cf-4c01-b5fb-401c8c200bbc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_74355d56-38fb-4b7a-8071-9b0c7f15c8ad" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_db3902f6-08cf-4c01-b5fb-401c8c200bbc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsNoncurrent_b70a7b27-1695-4fe8-a304-39d46e289908" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_74355d56-38fb-4b7a-8071-9b0c7f15c8ad" xlink:to="loc_us-gaap_DerivativeAssetsNoncurrent_b70a7b27-1695-4fe8-a304-39d46e289908" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_5ce89522-80c3-4787-8636-a93dbe375dd6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_74355d56-38fb-4b7a-8071-9b0c7f15c8ad" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_5ce89522-80c3-4787-8636-a93dbe375dd6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_2ec5b46e-482e-4b2b-81fc-2b38054782f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_74355d56-38fb-4b7a-8071-9b0c7f15c8ad" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_2ec5b46e-482e-4b2b-81fc-2b38054782f9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_61fbc5c9-56ce-45bb-a0a7-317c975b911e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_74355d56-38fb-4b7a-8071-9b0c7f15c8ad" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_61fbc5c9-56ce-45bb-a0a7-317c975b911e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_312f1152-1752-47fe-8962-3e34360317ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_74355d56-38fb-4b7a-8071-9b0c7f15c8ad" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_312f1152-1752-47fe-8962-3e34360317ec" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/FAIRVALUEMEASUREMENTSScheduleofFairValueLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#FAIRVALUEMEASUREMENTSScheduleofFairValueLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/FAIRVALUEMEASUREMENTSScheduleofFairValueLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_b9866064-1fc6-41e2-9585-721784894b99" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3dee9ebf-7a45-4d89-ae96-7562c71d856b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_b9866064-1fc6-41e2-9585-721784894b99" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3dee9ebf-7a45-4d89-ae96-7562c71d856b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_4f7b84de-241e-4e7b-96a2-b7e831356f17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3dee9ebf-7a45-4d89-ae96-7562c71d856b" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_4f7b84de-241e-4e7b-96a2-b7e831356f17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_4f7b84de-241e-4e7b-96a2-b7e831356f17_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_4f7b84de-241e-4e7b-96a2-b7e831356f17" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_4f7b84de-241e-4e7b-96a2-b7e831356f17_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_85976caf-318a-46ac-8e6f-ae1505009952" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_4f7b84de-241e-4e7b-96a2-b7e831356f17" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_85976caf-318a-46ac-8e6f-ae1505009952" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_2bb273cf-6226-4776-9640-b50da71bf685" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_85976caf-318a-46ac-8e6f-ae1505009952" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_2bb273cf-6226-4776-9640-b50da71bf685" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_da8906a4-3a6f-4ef9-8861-7f64e5e0cc3e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3dee9ebf-7a45-4d89-ae96-7562c71d856b" xlink:to="loc_us-gaap_FinancialInstrumentAxis_da8906a4-3a6f-4ef9-8861-7f64e5e0cc3e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_da8906a4-3a6f-4ef9-8861-7f64e5e0cc3e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_da8906a4-3a6f-4ef9-8861-7f64e5e0cc3e" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_da8906a4-3a6f-4ef9-8861-7f64e5e0cc3e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_cf6debbd-b9b3-4311-b9bb-2f42d1196e49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_da8906a4-3a6f-4ef9-8861-7f64e5e0cc3e" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_cf6debbd-b9b3-4311-b9bb-2f42d1196e49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeMember_e9b1ed49-a2f0-42e4-b2ac-a3e58892861b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_cf6debbd-b9b3-4311-b9bb-2f42d1196e49" xlink:to="loc_us-gaap_DerivativeMember_e9b1ed49-a2f0-42e4-b2ac-a3e58892861b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_ba1d8191-b0e9-43ee-a7c5-7f4fa3efe8c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3dee9ebf-7a45-4d89-ae96-7562c71d856b" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_ba1d8191-b0e9-43ee-a7c5-7f4fa3efe8c1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_ba1d8191-b0e9-43ee-a7c5-7f4fa3efe8c1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_ba1d8191-b0e9-43ee-a7c5-7f4fa3efe8c1" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_ba1d8191-b0e9-43ee-a7c5-7f4fa3efe8c1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_3fd0c5b3-3b60-42ad-b63c-f8bc6f242418" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_ba1d8191-b0e9-43ee-a7c5-7f4fa3efe8c1" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_3fd0c5b3-3b60-42ad-b63c-f8bc6f242418" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_EscrowConsiderationWithholdingMember_0c1ce8f4-0585-46f4-bd74-38ba21c25dd4" xlink:href="soun-20250930.xsd#soun_EscrowConsiderationWithholdingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_3fd0c5b3-3b60-42ad-b63c-f8bc6f242418" xlink:to="loc_soun_EscrowConsiderationWithholdingMember_0c1ce8f4-0585-46f4-bd74-38ba21c25dd4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationHoldbackLiabilityMember_fcc5817e-0c7b-426a-9779-8b701d31c41d" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationHoldbackLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_3fd0c5b3-3b60-42ad-b63c-f8bc6f242418" xlink:to="loc_soun_ContingentConsiderationHoldbackLiabilityMember_fcc5817e-0c7b-426a-9779-8b701d31c41d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationEarnoutLiabilityMember_361451e3-2553-4f94-884c-453f5c9aa821" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationEarnoutLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_3fd0c5b3-3b60-42ad-b63c-f8bc6f242418" xlink:to="loc_soun_ContingentConsiderationEarnoutLiabilityMember_361451e3-2553-4f94-884c-453f5c9aa821" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_feeb1a58-032e-4119-8ff1-0127da6d8e4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_3dee9ebf-7a45-4d89-ae96-7562c71d856b" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_feeb1a58-032e-4119-8ff1-0127da6d8e4e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_feeb1a58-032e-4119-8ff1-0127da6d8e4e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_feeb1a58-032e-4119-8ff1-0127da6d8e4e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_feeb1a58-032e-4119-8ff1-0127da6d8e4e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_760b7aba-4aef-4308-9b7e-70042fcbc57a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_feeb1a58-032e-4119-8ff1-0127da6d8e4e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_760b7aba-4aef-4308-9b7e-70042fcbc57a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_InteractionsAcquisitionMember_4233e271-3bc5-40af-9f6c-1d7458ae1aed" xlink:href="soun-20250930.xsd#soun_InteractionsAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_760b7aba-4aef-4308-9b7e-70042fcbc57a" xlink:to="loc_soun_InteractionsAcquisitionMember_4233e271-3bc5-40af-9f6c-1d7458ae1aed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_Synq3IncMember_cdca0e48-0da3-400e-87b1-38e2b44687af" xlink:href="soun-20250930.xsd#soun_Synq3IncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_760b7aba-4aef-4308-9b7e-70042fcbc57a" xlink:to="loc_soun_Synq3IncMember_cdca0e48-0da3-400e-87b1-38e2b44687af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_AmeliaTechnologiesLLCMember_43395e9a-7be9-4d9d-9de2-fd56b633bbd1" xlink:href="soun-20250930.xsd#soun_AmeliaTechnologiesLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_760b7aba-4aef-4308-9b7e-70042fcbc57a" xlink:to="loc_soun_AmeliaTechnologiesLLCMember_43395e9a-7be9-4d9d-9de2-fd56b633bbd1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_4a2187eb-2b5c-42f3-b253-7f69cc8086c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_b9866064-1fc6-41e2-9585-721784894b99" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_4a2187eb-2b5c-42f3-b253-7f69cc8086c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_0130496a-a88b-45a5-aaaa-d265f167fc39" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_4a2187eb-2b5c-42f3-b253-7f69cc8086c7" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_0130496a-a88b-45a5-aaaa-d265f167fc39" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_27cf8da9-9fc1-4a1d-9e35-675641fb2fd3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_4a2187eb-2b5c-42f3-b253-7f69cc8086c7" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_27cf8da9-9fc1-4a1d-9e35-675641fb2fd3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_a2562d85-6e1d-480c-944e-a23681b948c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_4a2187eb-2b5c-42f3-b253-7f69cc8086c7" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_a2562d85-6e1d-480c-944e-a23681b948c3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_1b562a14-be85-4c23-a07e-e8739e692c8b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_4a2187eb-2b5c-42f3-b253-7f69cc8086c7" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_1b562a14-be85-4c23-a07e-e8739e692c8b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_3f69133a-1e0d-4ff8-8906-e0862fa0a143" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_4a2187eb-2b5c-42f3-b253-7f69cc8086c7" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_3f69133a-1e0d-4ff8-8906-e0862fa0a143" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_08602bf1-6b1c-4f16-9aef-3195ad73bc9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/FAIRVALUEMEASUREMENTSNarrativeDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#FAIRVALUEMEASUREMENTSNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/FAIRVALUEMEASUREMENTSNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1c903835-aa96-46d4-8861-b402df8ed07d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6fc1771f-cc3b-493e-afa2-ecea98f59d79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1c903835-aa96-46d4-8861-b402df8ed07d" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6fc1771f-cc3b-493e-afa2-ecea98f59d79" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_158ee98f-4a28-45af-8892-a31a0f2c9979" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6fc1771f-cc3b-493e-afa2-ecea98f59d79" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_158ee98f-4a28-45af-8892-a31a0f2c9979" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_158ee98f-4a28-45af-8892-a31a0f2c9979_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_158ee98f-4a28-45af-8892-a31a0f2c9979" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_158ee98f-4a28-45af-8892-a31a0f2c9979_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_f63c0bee-daf8-48a8-bc43-cb8cb706669f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_158ee98f-4a28-45af-8892-a31a0f2c9979" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_f63c0bee-daf8-48a8-bc43-cb8cb706669f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_EscrowConsiderationWithholdingMember_1d2faf5c-9423-4156-8fbf-d8aea3485ce3" xlink:href="soun-20250930.xsd#soun_EscrowConsiderationWithholdingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_f63c0bee-daf8-48a8-bc43-cb8cb706669f" xlink:to="loc_soun_EscrowConsiderationWithholdingMember_1d2faf5c-9423-4156-8fbf-d8aea3485ce3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationHoldbackLiabilityMember_fc374d23-149b-4891-925d-591f39b5f3fd" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationHoldbackLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_f63c0bee-daf8-48a8-bc43-cb8cb706669f" xlink:to="loc_soun_ContingentConsiderationHoldbackLiabilityMember_fc374d23-149b-4891-925d-591f39b5f3fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationEarnoutLiabilityMember_11d86f27-87bf-48fb-8637-bbaf26afed71" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationEarnoutLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_f63c0bee-daf8-48a8-bc43-cb8cb706669f" xlink:to="loc_soun_ContingentConsiderationEarnoutLiabilityMember_11d86f27-87bf-48fb-8637-bbaf26afed71" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_3477d8d4-fd54-4662-b499-b92bce8039f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6fc1771f-cc3b-493e-afa2-ecea98f59d79" xlink:to="loc_us-gaap_FinancialInstrumentAxis_3477d8d4-fd54-4662-b499-b92bce8039f1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3477d8d4-fd54-4662-b499-b92bce8039f1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_3477d8d4-fd54-4662-b499-b92bce8039f1" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3477d8d4-fd54-4662-b499-b92bce8039f1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_795bae12-fdf8-4ce4-98b0-aa7e251b5765" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_3477d8d4-fd54-4662-b499-b92bce8039f1" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_795bae12-fdf8-4ce4-98b0-aa7e251b5765" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeMember_d6fb3ad1-4ccc-4458-87df-1d4182f3df1a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_795bae12-fdf8-4ce4-98b0-aa7e251b5765" xlink:to="loc_us-gaap_DerivativeMember_d6fb3ad1-4ccc-4458-87df-1d4182f3df1a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_3fbeacf9-69b8-47aa-874b-feac161240d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6fc1771f-cc3b-493e-afa2-ecea98f59d79" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_3fbeacf9-69b8-47aa-874b-feac161240d9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_3fbeacf9-69b8-47aa-874b-feac161240d9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_3fbeacf9-69b8-47aa-874b-feac161240d9" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_3fbeacf9-69b8-47aa-874b-feac161240d9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_ea33c914-a788-45c4-a061-fc4ee5a00332" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_3fbeacf9-69b8-47aa-874b-feac161240d9" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_ea33c914-a788-45c4-a061-fc4ee5a00332" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MeasurementInputHoldbackPeriodMember_3500f603-59f4-4020-be58-2fc4deb4ea87" xlink:href="soun-20250930.xsd#soun_MeasurementInputHoldbackPeriodMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_ea33c914-a788-45c4-a061-fc4ee5a00332" xlink:to="loc_soun_MeasurementInputHoldbackPeriodMember_3500f603-59f4-4020-be58-2fc4deb4ea87" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputExpectedDividendRateMember_1c75f1ef-e7a0-4bb1-a99a-9ea2d5dd4864" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputExpectedDividendRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_ea33c914-a788-45c4-a061-fc4ee5a00332" xlink:to="loc_us-gaap_MeasurementInputExpectedDividendRateMember_1c75f1ef-e7a0-4bb1-a99a-9ea2d5dd4864" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_d4420833-99c9-45c6-a41c-bd5b59e0c4b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6fc1771f-cc3b-493e-afa2-ecea98f59d79" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_d4420833-99c9-45c6-a41c-bd5b59e0c4b3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d4420833-99c9-45c6-a41c-bd5b59e0c4b3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_d4420833-99c9-45c6-a41c-bd5b59e0c4b3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d4420833-99c9-45c6-a41c-bd5b59e0c4b3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_133c3531-4c77-4bfe-be51-63a8d14d48a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_d4420833-99c9-45c6-a41c-bd5b59e0c4b3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_133c3531-4c77-4bfe-be51-63a8d14d48a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_AmeliaTechnologiesLLCMember_bd40c343-e1a0-4146-8e21-84532d5f0ebb" xlink:href="soun-20250930.xsd#soun_AmeliaTechnologiesLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_133c3531-4c77-4bfe-be51-63a8d14d48a6" xlink:to="loc_soun_AmeliaTechnologiesLLCMember_bd40c343-e1a0-4146-8e21-84532d5f0ebb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_Synq3IncMember_dd1628ef-e153-4171-ad10-77ae5c611080" xlink:href="soun-20250930.xsd#soun_Synq3IncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_133c3531-4c77-4bfe-be51-63a8d14d48a6" xlink:to="loc_soun_Synq3IncMember_dd1628ef-e153-4171-ad10-77ae5c611080" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionSharePrice_961926bb-8b64-47f7-b1ed-4818482a322e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionSharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1c903835-aa96-46d4-8861-b402df8ed07d" xlink:to="loc_us-gaap_BusinessAcquisitionSharePrice_961926bb-8b64-47f7-b1ed-4818482a322e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_c75092d5-d8d1-4852-a627-b476714665de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1c903835-aa96-46d4-8861-b402df8ed07d" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_c75092d5-d8d1-4852-a627-b476714665de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationContingentConsiderationLiabilityHoldbackPeriod_1646a29d-0bbf-4b99-9a19-e0b3dce29025" xlink:href="soun-20250930.xsd#soun_BusinessCombinationContingentConsiderationLiabilityHoldbackPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1c903835-aa96-46d4-8861-b402df8ed07d" xlink:to="loc_soun_BusinessCombinationContingentConsiderationLiabilityHoldbackPeriod_1646a29d-0bbf-4b99-9a19-e0b3dce29025" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_c044e506-2d63-4221-86ac-003dcfe3015d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1c903835-aa96-46d4-8861-b402df8ed07d" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_c044e506-2d63-4221-86ac-003dcfe3015d" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/FAIRVALUEMEASUREMENTSScheduleofHoldbackLiabilityDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#FAIRVALUEMEASUREMENTSScheduleofHoldbackLiabilityDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/FAIRVALUEMEASUREMENTSScheduleofHoldbackLiabilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2aee30c8-bb40-4cc7-9fb8-986b4f5deb40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6fc9750a-1af6-432e-bbd7-73aa2e6207bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2aee30c8-bb40-4cc7-9fb8-986b4f5deb40" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6fc9750a-1af6-432e-bbd7-73aa2e6207bf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_a9dcae63-00e8-4e87-9349-0c944bae5c56" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6fc9750a-1af6-432e-bbd7-73aa2e6207bf" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_a9dcae63-00e8-4e87-9349-0c944bae5c56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_a9dcae63-00e8-4e87-9349-0c944bae5c56_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_a9dcae63-00e8-4e87-9349-0c944bae5c56" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_a9dcae63-00e8-4e87-9349-0c944bae5c56_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_3488a787-a7db-425f-b38d-a05fca083e0f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_a9dcae63-00e8-4e87-9349-0c944bae5c56" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_3488a787-a7db-425f-b38d-a05fca083e0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationHoldbackLiabilityMember_af82c21e-fd5a-4ad8-987d-6c8cc29becab" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationHoldbackLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_3488a787-a7db-425f-b38d-a05fca083e0f" xlink:to="loc_soun_ContingentConsiderationHoldbackLiabilityMember_af82c21e-fd5a-4ad8-987d-6c8cc29becab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_036207a3-3fb8-4e7a-9b39-bdfaeb4535bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_6fc9750a-1af6-432e-bbd7-73aa2e6207bf" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_036207a3-3fb8-4e7a-9b39-bdfaeb4535bf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_036207a3-3fb8-4e7a-9b39-bdfaeb4535bf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_036207a3-3fb8-4e7a-9b39-bdfaeb4535bf" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_036207a3-3fb8-4e7a-9b39-bdfaeb4535bf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_aae6853c-15df-4e55-a27e-1da7dc7501ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_036207a3-3fb8-4e7a-9b39-bdfaeb4535bf" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_aae6853c-15df-4e55-a27e-1da7dc7501ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputRiskFreeInterestRateMember_fe151a2d-8780-41fc-934b-64a04e1458f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputRiskFreeInterestRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_aae6853c-15df-4e55-a27e-1da7dc7501ad" xlink:to="loc_us-gaap_MeasurementInputRiskFreeInterestRateMember_fe151a2d-8780-41fc-934b-64a04e1458f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MeasurementInputHoldbackPeriodMember_3f89d5bc-5d23-4196-87c0-26bdb90f1fd5" xlink:href="soun-20250930.xsd#soun_MeasurementInputHoldbackPeriodMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_aae6853c-15df-4e55-a27e-1da7dc7501ad" xlink:to="loc_soun_MeasurementInputHoldbackPeriodMember_3f89d5bc-5d23-4196-87c0-26bdb90f1fd5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_f3d2658e-f5b6-48a9-9d4b-3e46e0c84e22" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2aee30c8-bb40-4cc7-9fb8-986b4f5deb40" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_f3d2658e-f5b6-48a9-9d4b-3e46e0c84e22" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/FAIRVALUEMEASUREMENTSScheduleofEarnoutLiabilityDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#FAIRVALUEMEASUREMENTSScheduleofEarnoutLiabilityDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/FAIRVALUEMEASUREMENTSScheduleofEarnoutLiabilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1a96314d-debd-4bb6-abf2-565f130dce8b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_fe15ee49-27ee-4c63-8fb1-1698d9794c52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1a96314d-debd-4bb6-abf2-565f130dce8b" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_fe15ee49-27ee-4c63-8fb1-1698d9794c52" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_82fc0207-9a1c-4704-b717-9890207205b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_fe15ee49-27ee-4c63-8fb1-1698d9794c52" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_82fc0207-9a1c-4704-b717-9890207205b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_82fc0207-9a1c-4704-b717-9890207205b2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_82fc0207-9a1c-4704-b717-9890207205b2" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_82fc0207-9a1c-4704-b717-9890207205b2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_5d2d2580-cb4a-472c-bca3-2047ee1e6e7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContingentConsiderationTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContingentConsiderationByTypeAxis_82fc0207-9a1c-4704-b717-9890207205b2" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_5d2d2580-cb4a-472c-bca3-2047ee1e6e7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationEarnoutLiabilityMember_3483ec2c-282b-4114-ba59-882c032bc8ec" xlink:href="soun-20250930.xsd#soun_ContingentConsiderationEarnoutLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_5d2d2580-cb4a-472c-bca3-2047ee1e6e7c" xlink:to="loc_soun_ContingentConsiderationEarnoutLiabilityMember_3483ec2c-282b-4114-ba59-882c032bc8ec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_23548804-dfc2-48ae-8bfc-142b7431025f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_fe15ee49-27ee-4c63-8fb1-1698d9794c52" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_23548804-dfc2-48ae-8bfc-142b7431025f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_23548804-dfc2-48ae-8bfc-142b7431025f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_23548804-dfc2-48ae-8bfc-142b7431025f" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_23548804-dfc2-48ae-8bfc-142b7431025f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_9798189a-a7f7-4b2a-8234-34caeff126a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_23548804-dfc2-48ae-8bfc-142b7431025f" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_9798189a-a7f7-4b2a-8234-34caeff126a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_93dd4403-61e4-43cb-8db9-168787b831a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_9798189a-a7f7-4b2a-8234-34caeff126a1" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_93dd4403-61e4-43cb-8db9-168787b831a0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputPriceVolatilityMember_f9fe7893-d74c-483e-a433-ba546532b89f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputPriceVolatilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_9798189a-a7f7-4b2a-8234-34caeff126a1" xlink:to="loc_us-gaap_MeasurementInputPriceVolatilityMember_f9fe7893-d74c-483e-a433-ba546532b89f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputRiskFreeInterestRateMember_bf4c6308-863d-4f6c-ab6a-8eeb79f4809e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputRiskFreeInterestRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_9798189a-a7f7-4b2a-8234-34caeff126a1" xlink:to="loc_us-gaap_MeasurementInputRiskFreeInterestRateMember_bf4c6308-863d-4f6c-ab6a-8eeb79f4809e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputExpectedDividendRateMember_724c9c6c-61b7-4339-a9ba-af867b735998" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputExpectedDividendRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_9798189a-a7f7-4b2a-8234-34caeff126a1" xlink:to="loc_us-gaap_MeasurementInputExpectedDividendRateMember_724c9c6c-61b7-4339-a9ba-af867b735998" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputExpectedTermMember_c5c481d2-ea59-446f-8f1d-3a42ee110650" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputExpectedTermMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_9798189a-a7f7-4b2a-8234-34caeff126a1" xlink:to="loc_us-gaap_MeasurementInputExpectedTermMember_c5c481d2-ea59-446f-8f1d-3a42ee110650" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MeasurementInputEarnoutPaymentDiscountRateMember_7303451b-b82b-41af-b80e-1a312abaa004" xlink:href="soun-20250930.xsd#soun_MeasurementInputEarnoutPaymentDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_9798189a-a7f7-4b2a-8234-34caeff126a1" xlink:to="loc_soun_MeasurementInputEarnoutPaymentDiscountRateMember_7303451b-b82b-41af-b80e-1a312abaa004" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MeasurementInputMetricVolatilityMember_185778e2-4aa8-4fa5-80ec-11bd0eda1bce" xlink:href="soun-20250930.xsd#soun_MeasurementInputMetricVolatilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_9798189a-a7f7-4b2a-8234-34caeff126a1" xlink:to="loc_soun_MeasurementInputMetricVolatilityMember_185778e2-4aa8-4fa5-80ec-11bd0eda1bce" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MeasurementInputRiskFreeInterestRateStockPriceMember_c7bb6bf2-f5b3-43d8-a815-21c7bb9dcea8" xlink:href="soun-20250930.xsd#soun_MeasurementInputRiskFreeInterestRateStockPriceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_9798189a-a7f7-4b2a-8234-34caeff126a1" xlink:to="loc_soun_MeasurementInputRiskFreeInterestRateStockPriceMember_c7bb6bf2-f5b3-43d8-a815-21c7bb9dcea8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_04f1ea0f-9343-4b34-8f58-62ad6c61478d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_fe15ee49-27ee-4c63-8fb1-1698d9794c52" xlink:to="loc_srt_RangeAxis_04f1ea0f-9343-4b34-8f58-62ad6c61478d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_04f1ea0f-9343-4b34-8f58-62ad6c61478d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_04f1ea0f-9343-4b34-8f58-62ad6c61478d" xlink:to="loc_srt_RangeMember_04f1ea0f-9343-4b34-8f58-62ad6c61478d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_93704f5a-605c-4ce5-8dd7-aa17b7c99b84" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_04f1ea0f-9343-4b34-8f58-62ad6c61478d" xlink:to="loc_srt_RangeMember_93704f5a-605c-4ce5-8dd7-aa17b7c99b84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_9c57088c-5601-4f22-9118-d92c7be36081" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_93704f5a-605c-4ce5-8dd7-aa17b7c99b84" xlink:to="loc_srt_MinimumMember_9c57088c-5601-4f22-9118-d92c7be36081" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_2159788d-4917-4ab4-b8ca-a3569b05ed40" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_93704f5a-605c-4ce5-8dd7-aa17b7c99b84" xlink:to="loc_srt_MaximumMember_2159788d-4917-4ab4-b8ca-a3569b05ed40" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_640a18dd-e7c1-4e36-9c7c-0bab4db0c54d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_fe15ee49-27ee-4c63-8fb1-1698d9794c52" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_640a18dd-e7c1-4e36-9c7c-0bab4db0c54d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_640a18dd-e7c1-4e36-9c7c-0bab4db0c54d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_640a18dd-e7c1-4e36-9c7c-0bab4db0c54d" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_640a18dd-e7c1-4e36-9c7c-0bab4db0c54d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8c0e3700-4610-4d94-85f6-6cb5e66c2dd8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_640a18dd-e7c1-4e36-9c7c-0bab4db0c54d" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8c0e3700-4610-4d94-85f6-6cb5e66c2dd8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_Synq3IncMember_64fa6896-2971-4142-b920-7a28ff8344e8" xlink:href="soun-20250930.xsd#soun_Synq3IncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8c0e3700-4610-4d94-85f6-6cb5e66c2dd8" xlink:to="loc_soun_Synq3IncMember_64fa6896-2971-4142-b920-7a28ff8344e8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_AmeliaTechnologiesLLCMember_c15c18c0-3b1f-4b99-b1ee-530ad8bfe81b" xlink:href="soun-20250930.xsd#soun_AmeliaTechnologiesLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8c0e3700-4610-4d94-85f6-6cb5e66c2dd8" xlink:to="loc_soun_AmeliaTechnologiesLLCMember_c15c18c0-3b1f-4b99-b1ee-530ad8bfe81b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_InteractionsAcquisitionMember_8dbcbe1a-ec0b-4417-8232-84ea25857466" xlink:href="soun-20250930.xsd#soun_InteractionsAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8c0e3700-4610-4d94-85f6-6cb5e66c2dd8" xlink:to="loc_soun_InteractionsAcquisitionMember_8dbcbe1a-ec0b-4417-8232-84ea25857466" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_42fcab29-c982-47df-ad6c-fd4718aca2cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_1a96314d-debd-4bb6-abf2-565f130dce8b" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_42fcab29-c982-47df-ad6c-fd4718aca2cf" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/SEGMENTINFORMATIONDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#SEGMENTINFORMATIONDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/SEGMENTINFORMATIONDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_fcae13c7-2b2b-40e0-be7d-6ef91561b94a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_d05a9327-03ab-4374-941e-2f322687af00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_fcae13c7-2b2b-40e0-be7d-6ef91561b94a" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_d05a9327-03ab-4374-941e-2f322687af00" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_cdf19843-e47a-40ca-b6a0-0358d87091d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_d05a9327-03ab-4374-941e-2f322687af00" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_cdf19843-e47a-40ca-b6a0-0358d87091d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_cdf19843-e47a-40ca-b6a0-0358d87091d5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_cdf19843-e47a-40ca-b6a0-0358d87091d5" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_cdf19843-e47a-40ca-b6a0-0358d87091d5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_13780bc1-1c84-4f74-972d-b0a185b7fed9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_cdf19843-e47a-40ca-b6a0-0358d87091d5" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_13780bc1-1c84-4f74-972d-b0a185b7fed9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_OperatingExpensesBenchmarkMember_d33846b5-2a81-4fce-b00f-3f47cf9d1a4e" xlink:href="soun-20250930.xsd#soun_OperatingExpensesBenchmarkMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_13780bc1-1c84-4f74-972d-b0a185b7fed9" xlink:to="loc_soun_OperatingExpensesBenchmarkMember_d33846b5-2a81-4fce-b00f-3f47cf9d1a4e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_773730a0-3358-4a70-8a07-412a49ea75e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_d05a9327-03ab-4374-941e-2f322687af00" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_773730a0-3358-4a70-8a07-412a49ea75e5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_773730a0-3358-4a70-8a07-412a49ea75e5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_773730a0-3358-4a70-8a07-412a49ea75e5" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_773730a0-3358-4a70-8a07-412a49ea75e5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_828f5ae9-d273-4bcf-9332-23235d9d85c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_773730a0-3358-4a70-8a07-412a49ea75e5" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_828f5ae9-d273-4bcf-9332-23235d9d85c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborForceConcentrationRiskMember_215970ee-6465-49a3-9d14-d69d639ccde7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LaborForceConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_828f5ae9-d273-4bcf-9332-23235d9d85c8" xlink:to="loc_us-gaap_LaborForceConcentrationRiskMember_215970ee-6465-49a3-9d14-d69d639ccde7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_71799df1-2ec8-4d1e-be46-5febe7e8e338" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_d05a9327-03ab-4374-941e-2f322687af00" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_71799df1-2ec8-4d1e-be46-5febe7e8e338" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_71799df1-2ec8-4d1e-be46-5febe7e8e338_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_71799df1-2ec8-4d1e-be46-5febe7e8e338" xlink:to="loc_us-gaap_SegmentDomain_71799df1-2ec8-4d1e-be46-5febe7e8e338_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_d4894443-32e4-4163-97dc-1d11722265c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_71799df1-2ec8-4d1e-be46-5febe7e8e338" xlink:to="loc_us-gaap_SegmentDomain_d4894443-32e4-4163-97dc-1d11722265c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ReportableSegmentMember_cbf0f254-aa99-48ff-a211-8c095b6e8db2" xlink:href="soun-20250930.xsd#soun_ReportableSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_d4894443-32e4-4163-97dc-1d11722265c0" xlink:to="loc_soun_ReportableSegmentMember_cbf0f254-aa99-48ff-a211-8c095b6e8db2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_881b824a-892b-4a5c-acd3-267f1d43af88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_fcae13c7-2b2b-40e0-be7d-6ef91561b94a" xlink:to="loc_us-gaap_NumberOfReportableSegments_881b824a-892b-4a5c-acd3-267f1d43af88" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_05a6aa5c-6edc-4b1b-ba83-51627205d445" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_fcae13c7-2b2b-40e0-be7d-6ef91561b94a" xlink:to="loc_us-gaap_LaborAndRelatedExpense_05a6aa5c-6edc-4b1b-ba83-51627205d445" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_973937e6-b786-46b9-8452-bd244d304cbf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_fcae13c7-2b2b-40e0-be7d-6ef91561b94a" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_973937e6-b786-46b9-8452-bd244d304cbf" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/RELATEDPARTYTRANSACTIONSDetails" xlink:type="simple" xlink:href="soun-20250930.xsd#RELATEDPARTYTRANSACTIONSDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/RELATEDPARTYTRANSACTIONSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_432feade-a1b1-4551-925b-2e8354af069d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_68017b78-9092-487c-90e7-9d31ac505116" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_432feade-a1b1-4551-925b-2e8354af069d" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_68017b78-9092-487c-90e7-9d31ac505116" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_7e15eeba-5c89-449e-aef7-c1ef720a1532" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_68017b78-9092-487c-90e7-9d31ac505116" xlink:to="loc_us-gaap_StatementClassOfStockAxis_7e15eeba-5c89-449e-aef7-c1ef720a1532" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_7e15eeba-5c89-449e-aef7-c1ef720a1532_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_7e15eeba-5c89-449e-aef7-c1ef720a1532" xlink:to="loc_us-gaap_ClassOfStockDomain_7e15eeba-5c89-449e-aef7-c1ef720a1532_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_259a955c-3f1d-42a4-859a-72af51330f24" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_7e15eeba-5c89-449e-aef7-c1ef720a1532" xlink:to="loc_us-gaap_ClassOfStockDomain_259a955c-3f1d-42a4-859a-72af51330f24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_61a25a64-5f8a-4ec3-bd99-af42f40932f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_259a955c-3f1d-42a4-859a-72af51330f24" xlink:to="loc_us-gaap_CommonClassAMember_61a25a64-5f8a-4ec3-bd99-af42f40932f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_b6456c4e-14eb-4655-8dcd-61ecc8f97685" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_68017b78-9092-487c-90e7-9d31ac505116" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_b6456c4e-14eb-4655-8dcd-61ecc8f97685" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_b6456c4e-14eb-4655-8dcd-61ecc8f97685_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_b6456c4e-14eb-4655-8dcd-61ecc8f97685" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_b6456c4e-14eb-4655-8dcd-61ecc8f97685_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_59926522-734d-4a88-923c-f97a2a808ac8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_b6456c4e-14eb-4655-8dcd-61ecc8f97685" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_59926522-734d-4a88-923c-f97a2a808ac8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SecondEquityDistributionAgreementMember_cfa714a3-a572-4e99-abb3-373df1e08467" xlink:href="soun-20250930.xsd#soun_SecondEquityDistributionAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_59926522-734d-4a88-923c-f97a2a808ac8" xlink:to="loc_soun_SecondEquityDistributionAgreementMember_cfa714a3-a572-4e99-abb3-373df1e08467" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ControlledEquityOfferingSalesAgreementMember_bccf6cb3-2137-4d15-964c-db79899d5b5f" xlink:href="soun-20250930.xsd#soun_ControlledEquityOfferingSalesAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_59926522-734d-4a88-923c-f97a2a808ac8" xlink:to="loc_soun_ControlledEquityOfferingSalesAgreementMember_bccf6cb3-2137-4d15-964c-db79899d5b5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_5cc1f28d-7a3b-4c5b-9ae6-657c65c74e3b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_68017b78-9092-487c-90e7-9d31ac505116" xlink:to="loc_srt_CounterpartyNameAxis_5cc1f28d-7a3b-4c5b-9ae6-657c65c74e3b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_5cc1f28d-7a3b-4c5b-9ae6-657c65c74e3b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_5cc1f28d-7a3b-4c5b-9ae6-657c65c74e3b" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_5cc1f28d-7a3b-4c5b-9ae6-657c65c74e3b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_349fc5e2-387b-425e-982c-663beba4d114" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_5cc1f28d-7a3b-4c5b-9ae6-657c65c74e3b" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_349fc5e2-387b-425e-982c-663beba4d114" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_GuggenheimSecuritiesLLCMember_303c4680-d693-4147-b25a-84a24f556be9" xlink:href="soun-20250930.xsd#soun_GuggenheimSecuritiesLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_349fc5e2-387b-425e-982c-663beba4d114" xlink:to="loc_soun_GuggenheimSecuritiesLLCMember_303c4680-d693-4147-b25a-84a24f556be9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_e274b5dc-327e-4d2d-aaf4-247036a92aa7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_68017b78-9092-487c-90e7-9d31ac505116" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_e274b5dc-327e-4d2d-aaf4-247036a92aa7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_e274b5dc-327e-4d2d-aaf4-247036a92aa7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_e274b5dc-327e-4d2d-aaf4-247036a92aa7" xlink:to="loc_us-gaap_RelatedPartyDomain_e274b5dc-327e-4d2d-aaf4-247036a92aa7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_abbd0f10-1af3-47c0-a678-d7e4479707bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_e274b5dc-327e-4d2d-aaf4-247036a92aa7" xlink:to="loc_us-gaap_RelatedPartyDomain_abbd0f10-1af3-47c0-a678-d7e4479707bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_a028293a-ec98-4aed-a4f6-bf4b873a685d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_abbd0f10-1af3-47c0-a678-d7e4479707bd" xlink:to="loc_us-gaap_RelatedPartyMember_a028293a-ec98-4aed-a4f6-bf4b873a685d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SaleOfStockSharesOfStockAuthorizedToBeOfferedAndSold_4f4f3f98-941c-46ff-9008-6c0a5c5d4c2e" xlink:href="soun-20250930.xsd#soun_SaleOfStockSharesOfStockAuthorizedToBeOfferedAndSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_432feade-a1b1-4551-925b-2e8354af069d" xlink:to="loc_soun_SaleOfStockSharesOfStockAuthorizedToBeOfferedAndSold_4f4f3f98-941c-46ff-9008-6c0a5c5d4c2e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForCommissions_06275deb-cabf-46b7-a302-8646b108dcd6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForCommissions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_432feade-a1b1-4551-925b-2e8354af069d" xlink:to="loc_us-gaap_PaymentsForCommissions_06275deb-cabf-46b7-a302-8646b108dcd6" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#IndividualsOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllIndividualsMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AllIndividualsMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_Dr.KeyvanMohajerMember_4846ca46-1120-4ac0-952f-eb951e96fc9b" xlink:href="soun-20250930.xsd#soun_Dr.KeyvanMohajerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_soun_Dr.KeyvanMohajerMember_4846ca46-1120-4ac0-952f-eb951e96fc9b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_JamesM.HomMember_8bb65f8f-fde5-4b21-b579-baef939c0120" xlink:href="soun-20250930.xsd#soun_JamesM.HomMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_soun_JamesM.HomMember_8bb65f8f-fde5-4b21-b579-baef939c0120" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MajidEmamiMember_22881fe5-348f-4cd1-8a8e-8ab667d16614" xlink:href="soun-20250930.xsd#soun_MajidEmamiMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_soun_MajidEmamiMember_22881fe5-348f-4cd1-8a8e-8ab667d16614" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_DianaSrokaMember_b5ea8b9f-de72-4f0c-b85b-7ab0d2657b8c" xlink:href="soun-20250930.xsd#soun_DianaSrokaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_soun_DianaSrokaMember_b5ea8b9f-de72-4f0c-b85b-7ab0d2657b8c" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/TradingArrangementsOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#TradingArrangmentsOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/role/TradingArrangementsOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ecd_AllTradingArrangementsMember" xlink:href="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd#ecd_AllTradingArrangementsMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_Dr.KeyvanMohajerClassBCommonStockTradingArrangementMember_4d15687e-cf1c-428c-b1dc-a660e9692248" xlink:href="soun-20250930.xsd#soun_Dr.KeyvanMohajerClassBCommonStockTradingArrangementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllTradingArrangementsMember" xlink:to="loc_soun_Dr.KeyvanMohajerClassBCommonStockTradingArrangementMember_4d15687e-cf1c-428c-b1dc-a660e9692248" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_Dr.KeyvanMohajerClassACommonStockUponVestingAndSettlementOfRSUsAndPSUsTradingArrangementMember_84d9de43-8f1e-41fa-931a-a90a44ab6cc1" xlink:href="soun-20250930.xsd#soun_Dr.KeyvanMohajerClassACommonStockUponVestingAndSettlementOfRSUsAndPSUsTradingArrangementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllTradingArrangementsMember" xlink:to="loc_soun_Dr.KeyvanMohajerClassACommonStockUponVestingAndSettlementOfRSUsAndPSUsTradingArrangementMember_84d9de43-8f1e-41fa-931a-a90a44ab6cc1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_JamesM.HomMay2025TradingArrangementMember_29c56543-4610-4d12-94c2-3999e03e26c6" xlink:href="soun-20250930.xsd#soun_JamesM.HomMay2025TradingArrangementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllTradingArrangementsMember" xlink:to="loc_soun_JamesM.HomMay2025TradingArrangementMember_29c56543-4610-4d12-94c2-3999e03e26c6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_JamesM.HomClassBCommonStockTradingArrangementMay2025Member_02879e04-ffe5-4eb1-b0a2-4d5c68b75ea2" xlink:href="soun-20250930.xsd#soun_JamesM.HomClassBCommonStockTradingArrangementMay2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllTradingArrangementsMember" xlink:to="loc_soun_JamesM.HomClassBCommonStockTradingArrangementMay2025Member_02879e04-ffe5-4eb1-b0a2-4d5c68b75ea2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_JamesM.HomTradingArrangementClassACommonStockUponVestingAndSettlementOfRSUsMay2025Member_32a135e4-ef6b-4863-9b82-1a270b76efec" xlink:href="soun-20250930.xsd#soun_JamesM.HomTradingArrangementClassACommonStockUponVestingAndSettlementOfRSUsMay2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllTradingArrangementsMember" xlink:to="loc_soun_JamesM.HomTradingArrangementClassACommonStockUponVestingAndSettlementOfRSUsMay2025Member_32a135e4-ef6b-4863-9b82-1a270b76efec" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_JamesM.HomClassBCommonStockTradingArrangementMember_884baf22-7b68-4712-9cac-ea247f45814d" xlink:href="soun-20250930.xsd#soun_JamesM.HomClassBCommonStockTradingArrangementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllTradingArrangementsMember" xlink:to="loc_soun_JamesM.HomClassBCommonStockTradingArrangementMember_884baf22-7b68-4712-9cac-ea247f45814d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_JamesM.HomTradingArrangementClassACommonStockUponVestingAndSettlementOfRSUsMember_93038ddc-2301-4de8-b4b6-135f40e8fd80" xlink:href="soun-20250930.xsd#soun_JamesM.HomTradingArrangementClassACommonStockUponVestingAndSettlementOfRSUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllTradingArrangementsMember" xlink:to="loc_soun_JamesM.HomTradingArrangementClassACommonStockUponVestingAndSettlementOfRSUsMember_93038ddc-2301-4de8-b4b6-135f40e8fd80" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MajidEmamiClassBCommonStockTradingArrangementMember_ea6ccf77-210b-4b65-a85f-1dcf58f7a6d5" xlink:href="soun-20250930.xsd#soun_MajidEmamiClassBCommonStockTradingArrangementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllTradingArrangementsMember" xlink:to="loc_soun_MajidEmamiClassBCommonStockTradingArrangementMember_ea6ccf77-210b-4b65-a85f-1dcf58f7a6d5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MajidEmamiClassACommonStockUponVestingAndSettlementOfRSUsAndPSUsTradingArrangementMember_7f44d6c7-e680-49a1-8fa0-f2b5e9668060" xlink:href="soun-20250930.xsd#soun_MajidEmamiClassACommonStockUponVestingAndSettlementOfRSUsAndPSUsTradingArrangementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllTradingArrangementsMember" xlink:to="loc_soun_MajidEmamiClassACommonStockUponVestingAndSettlementOfRSUsAndPSUsTradingArrangementMember_7f44d6c7-e680-49a1-8fa0-f2b5e9668060" xlink:type="arc" order="9"/>
  </link:definitionLink>
</link:linkbase>
