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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019cb0a2-fd7d-7daa-9749-d669d54dc77e,g:8a05419a-6823-4df8-9bd6-35af0e46dd06-->
<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-20260331.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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_019cb0a2-ff86-77fe-a1a8-82db7b35e0bc" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_DocumentInformationTable_019cb0a2-ff86-77fe-a1a8-82db7b35e0bc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019cb0a2-ff86-7f73-8ccf-9c10b37cd635" 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_019cb0a2-ff86-77fe-a1a8-82db7b35e0bc" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019cb0a2-ff86-7f73-8ccf-9c10b37cd635" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb0a2-ff86-7f73-8ccf-9c10b37cd635_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_019cb0a2-ff86-7f73-8ccf-9c10b37cd635" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb0a2-ff86-7f73-8ccf-9c10b37cd635_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb0a2-ff86-7064-b3b0-9ef559b6ff62" 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_019cb0a2-ff86-7f73-8ccf-9c10b37cd635" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb0a2-ff86-7064-b3b0-9ef559b6ff62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019cb0a2-ff86-736b-a96b-d917078b4510" 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_019cb0a2-ff86-7064-b3b0-9ef559b6ff62" xlink:to="loc_us-gaap_CommonClassAMember_019cb0a2-ff86-736b-a96b-d917078b4510" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_019cb0a2-ff86-755c-973f-b49681115c86" 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_019cb0a2-ff86-7064-b3b0-9ef559b6ff62" xlink:to="loc_us-gaap_WarrantMember_019cb0a2-ff86-755c-973f-b49681115c86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019cb0a2-ff86-74a6-a4e6-a83e98c6e91c" 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_019cb0a2-ff86-7064-b3b0-9ef559b6ff62" xlink:to="loc_us-gaap_CommonClassBMember_019cb0a2-ff86-74a6-a4e6-a83e98c6e91c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019cb0a2-ff86-75cd-ac09-e0b6fd937f37" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_DocumentType_019cb0a2-ff86-75cd-ac09-e0b6fd937f37" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_019cb0a2-ff86-7da8-b6f9-d77fbe15244e" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_DocumentQuarterlyReport_019cb0a2-ff86-7da8-b6f9-d77fbe15244e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019cb0a2-ff86-7fe9-ba43-209577c1cbc4" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_DocumentPeriodEndDate_019cb0a2-ff86-7fe9-ba43-209577c1cbc4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_019cb0a2-ff87-799b-a4e6-fc7ce4f288b6" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_DocumentTransitionReport_019cb0a2-ff87-799b-a4e6-fc7ce4f288b6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019cb0a2-ff87-77c0-8a1d-938878238eda" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_EntityFileNumber_019cb0a2-ff87-77c0-8a1d-938878238eda" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019cb0a2-ff87-7b98-a1d9-3710757ad40f" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_EntityRegistrantName_019cb0a2-ff87-7b98-a1d9-3710757ad40f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019cb0a2-ff87-77af-90b6-4cd300e25581" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019cb0a2-ff87-77af-90b6-4cd300e25581" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019cb0a2-ff87-7dc3-a150-09452a27d8b5" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_EntityTaxIdentificationNumber_019cb0a2-ff87-7dc3-a150-09452a27d8b5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019cb0a2-ff87-7957-972f-d23c6277a81d" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_EntityAddressAddressLine1_019cb0a2-ff87-7957-972f-d23c6277a81d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019cb0a2-ff87-71ac-a947-b6b0fed65f5b" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_EntityAddressCityOrTown_019cb0a2-ff87-71ac-a947-b6b0fed65f5b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019cb0a2-ff87-75c9-98ea-8e66f5d2aedd" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_EntityAddressStateOrProvince_019cb0a2-ff87-75c9-98ea-8e66f5d2aedd" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019cb0a2-ff87-752d-8194-245a5958efb9" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_EntityAddressPostalZipCode_019cb0a2-ff87-752d-8194-245a5958efb9" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019cb0a2-ff87-7dca-8a20-094a0c6b3d53" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_CityAreaCode_019cb0a2-ff87-7dca-8a20-094a0c6b3d53" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019cb0a2-ff87-7552-954f-ee909a5d2bd7" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_LocalPhoneNumber_019cb0a2-ff87-7552-954f-ee909a5d2bd7" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019cb0a2-ff87-7824-98bf-8afa5a351515" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_Security12bTitle_019cb0a2-ff87-7824-98bf-8afa5a351515" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019cb0a2-ff87-7066-a960-da54e0b0cd46" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_TradingSymbol_019cb0a2-ff87-7066-a960-da54e0b0cd46" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019cb0a2-ff87-751a-978b-48536df66946" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_SecurityExchangeName_019cb0a2-ff87-751a-978b-48536df66946" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_019cb0a2-ff87-7034-9412-274659c8046a" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_EntityCurrentReportingStatus_019cb0a2-ff87-7034-9412-274659c8046a" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_019cb0a2-ff87-743f-8bcc-64381b3d64fc" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_EntityInteractiveDataCurrent_019cb0a2-ff87-743f-8bcc-64381b3d64fc" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_019cb0a2-ff87-7ce7-8689-b73b7b17ce91" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_EntityFilerCategory_019cb0a2-ff87-7ce7-8689-b73b7b17ce91" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_019cb0a2-ff87-70dd-8782-0f4e62fd4029" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_EntitySmallBusiness_019cb0a2-ff87-70dd-8782-0f4e62fd4029" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019cb0a2-ff87-7c35-ac7b-281000a281f8" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_EntityEmergingGrowthCompany_019cb0a2-ff87-7c35-ac7b-281000a281f8" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_019cb0a2-ff87-7b6c-8b31-049239f35b49" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_EntityShellCompany_019cb0a2-ff87-7b6c-8b31-049239f35b49" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_019cb0a2-ff87-7e73-900b-4ebafebc6a5b" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_019cb0a2-ff87-7e73-900b-4ebafebc6a5b" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019cb0a2-ff87-7914-b050-c5a8b7b5e2b3" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_EntityCentralIndexKey_019cb0a2-ff87-7914-b050-c5a8b7b5e2b3" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_019cb0a2-ff87-7231-9b2e-2d888e640a12" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_DocumentFiscalPeriodFocus_019cb0a2-ff87-7231-9b2e-2d888e640a12" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_019cb0a2-ff87-74e6-a65d-7e15bcb2611e" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_DocumentFiscalYearFocus_019cb0a2-ff87-74e6-a65d-7e15bcb2611e" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019cb0a2-ff87-7a56-b568-1c06f42ef3db" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_AmendmentFlag_019cb0a2-ff87-7a56-b568-1c06f42ef3db" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_019cb0a2-ff87-7e8c-8f39-3a2191bb802a" 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_019cb0a2-ff86-7df0-b8a0-30eed0bd4cf0" xlink:to="loc_dei_CurrentFiscalYearEndDate_019cb0a2-ff87-7e8c-8f39-3a2191bb802a" xlink:type="arc" order="28"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="soun-20260331.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_019cb0a2-ff87-7b92-9cee-eeed2d27ee05" 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_019cb0a2-ff87-7f19-94a4-48056ea76b37" 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_019cb0a2-ff87-7b92-9cee-eeed2d27ee05" xlink:to="loc_us-gaap_StatementTable_019cb0a2-ff87-7f19-94a4-48056ea76b37" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019cb0a2-ff87-7121-bfe0-0d31c7a89338" 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_019cb0a2-ff87-7f19-94a4-48056ea76b37" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019cb0a2-ff87-7121-bfe0-0d31c7a89338" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb0a2-ff87-7121-bfe0-0d31c7a89338_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_019cb0a2-ff87-7121-bfe0-0d31c7a89338" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb0a2-ff87-7121-bfe0-0d31c7a89338_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb0a2-ff87-7b8e-8b12-724d2da025d1" 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_019cb0a2-ff87-7121-bfe0-0d31c7a89338" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb0a2-ff87-7b8e-8b12-724d2da025d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019cb0a2-ff87-725a-9506-2a4643c8fe3d" 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_019cb0a2-ff87-7b8e-8b12-724d2da025d1" xlink:to="loc_us-gaap_CommonClassAMember_019cb0a2-ff87-725a-9506-2a4643c8fe3d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019cb0a2-ff87-7f61-b3b9-2a3d4be3d0b2" 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_019cb0a2-ff87-7b8e-8b12-724d2da025d1" xlink:to="loc_us-gaap_CommonClassBMember_019cb0a2-ff87-7f61-b3b9-2a3d4be3d0b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019cb0a2-ff87-739e-83d3-b7340cff28ea" 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_019cb0a2-ff87-7b92-9cee-eeed2d27ee05" xlink:to="loc_us-gaap_AssetsAbstract_019cb0a2-ff87-739e-83d3-b7340cff28ea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrentAbstract_019cb0a2-ff87-7f41-9831-2c15ad9287f9" 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_019cb0a2-ff87-739e-83d3-b7340cff28ea" xlink:to="loc_us-gaap_AssetsCurrentAbstract_019cb0a2-ff87-7f41-9831-2c15ad9287f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019cb0a2-ff87-7264-a88c-d0f92eaf6ee1" 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_019cb0a2-ff87-7f41-9831-2c15ad9287f9" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019cb0a2-ff87-7264-a88c-d0f92eaf6ee1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNet_019cb0a2-ff87-7551-be91-fcfa3823ec78" 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_019cb0a2-ff87-7f41-9831-2c15ad9287f9" xlink:to="loc_us-gaap_AccountsReceivableNet_019cb0a2-ff87-7551-be91-fcfa3823ec78" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContractWithCustomerAssetAfterAllowanceForCreditLossIncludingUnbilledReceivablesCurrent_019cb0a2-ff87-71e2-9314-ef907a53340f" xlink:href="soun-20260331.xsd#soun_ContractWithCustomerAssetAfterAllowanceForCreditLossIncludingUnbilledReceivablesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019cb0a2-ff87-7f41-9831-2c15ad9287f9" xlink:to="loc_soun_ContractWithCustomerAssetAfterAllowanceForCreditLossIncludingUnbilledReceivablesCurrent_019cb0a2-ff87-71e2-9314-ef907a53340f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_019cb0a2-ff87-7939-8ffc-b7d44402a7fc" 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_019cb0a2-ff87-7f41-9831-2c15ad9287f9" xlink:to="loc_us-gaap_OtherAssetsCurrent_019cb0a2-ff87-7939-8ffc-b7d44402a7fc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_019cb0a2-ff87-7016-9c83-64afd4714bea" 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_019cb0a2-ff87-7f41-9831-2c15ad9287f9" xlink:to="loc_us-gaap_AssetsCurrent_019cb0a2-ff87-7016-9c83-64afd4714bea" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsNoncurrent_019cb0a2-ff87-78e1-83ed-d6336ff3e188" 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_019cb0a2-ff87-739e-83d3-b7340cff28ea" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsNoncurrent_019cb0a2-ff87-78e1-83ed-d6336ff3e188" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_019cb0a2-ff87-771c-b2d5-5d8ce3a0e727" 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_019cb0a2-ff87-739e-83d3-b7340cff28ea" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_019cb0a2-ff87-771c-b2d5-5d8ce3a0e727" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019cb0a2-ff87-7364-8383-63b301f7a52d" 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_019cb0a2-ff87-739e-83d3-b7340cff28ea" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019cb0a2-ff87-7364-8383-63b301f7a52d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019cb0a2-ff87-70b8-a473-d4f6c07304fd" 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_019cb0a2-ff87-739e-83d3-b7340cff28ea" xlink:to="loc_us-gaap_Goodwill_019cb0a2-ff87-70b8-a473-d4f6c07304fd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019cb0a2-ff87-7840-911c-7fea2f0fd68c" 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_019cb0a2-ff87-739e-83d3-b7340cff28ea" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019cb0a2-ff87-7840-911c-7fea2f0fd68c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_019cb0a2-ff87-7a94-ace1-4299e2ec0b6e" 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_019cb0a2-ff87-739e-83d3-b7340cff28ea" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_019cb0a2-ff87-7a94-ace1-4299e2ec0b6e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetNoncurrent_019cb0a2-ff87-72c0-a5c4-996446d1b0e5" 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_019cb0a2-ff87-739e-83d3-b7340cff28ea" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetNoncurrent_019cb0a2-ff87-72c0-a5c4-996446d1b0e5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_019cb0a2-ff87-7c50-be75-3f72b519a809" 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_019cb0a2-ff87-739e-83d3-b7340cff28ea" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_019cb0a2-ff87-7c50-be75-3f72b519a809" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019cb0a2-ff87-7a35-9329-d168346eb9a6" 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_019cb0a2-ff87-739e-83d3-b7340cff28ea" xlink:to="loc_us-gaap_Assets_019cb0a2-ff87-7a35-9329-d168346eb9a6" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019cb0a2-ff87-78cd-816a-289d13dfdc14" 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_019cb0a2-ff87-7b92-9cee-eeed2d27ee05" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019cb0a2-ff87-78cd-816a-289d13dfdc14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_019cb0a2-ff87-788b-b5f8-6892ef1a8dc7" 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_019cb0a2-ff87-78cd-816a-289d13dfdc14" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_019cb0a2-ff87-788b-b5f8-6892ef1a8dc7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_019cb0a2-ff87-7c05-859a-6ba984aac81c" 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_019cb0a2-ff87-788b-b5f8-6892ef1a8dc7" xlink:to="loc_us-gaap_AccountsPayableCurrent_019cb0a2-ff87-7c05-859a-6ba984aac81c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_019cb0a2-ff87-754b-bb8e-07e424568770" 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_019cb0a2-ff87-788b-b5f8-6892ef1a8dc7" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_019cb0a2-ff87-754b-bb8e-07e424568770" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_019cb0a2-ff87-7d19-af31-948d7da8148e" 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_019cb0a2-ff87-788b-b5f8-6892ef1a8dc7" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_019cb0a2-ff87-7d19-af31-948d7da8148e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_019cb0a2-ff87-7d3f-bace-0c27a40b516a" 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_019cb0a2-ff87-788b-b5f8-6892ef1a8dc7" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent_019cb0a2-ff87-7d3f-bace-0c27a40b516a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxesPayableCurrent_019cb0a2-ff87-7c11-bfbf-0dd8ca68c938" 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_019cb0a2-ff87-788b-b5f8-6892ef1a8dc7" xlink:to="loc_us-gaap_TaxesPayableCurrent_019cb0a2-ff87-7c11-bfbf-0dd8ca68c938" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_019cb0a2-ff87-7091-90a1-6d68064eb17a" 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_019cb0a2-ff87-788b-b5f8-6892ef1a8dc7" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_019cb0a2-ff87-7091-90a1-6d68064eb17a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_019cb0a2-ff87-7405-bf64-2f1657232c92" 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_019cb0a2-ff87-788b-b5f8-6892ef1a8dc7" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_019cb0a2-ff87-7405-bf64-2f1657232c92" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_019cb0a2-ff87-72a2-9232-4e0b092c740b" 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_019cb0a2-ff87-788b-b5f8-6892ef1a8dc7" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_019cb0a2-ff87-72a2-9232-4e0b092c740b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_019cb0a2-ff87-779a-b439-774ff388883b" 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_019cb0a2-ff87-788b-b5f8-6892ef1a8dc7" xlink:to="loc_us-gaap_LiabilitiesCurrent_019cb0a2-ff87-779a-b439-774ff388883b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019cb0a2-ff87-749f-a40b-2f08b90d1d6e" 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_019cb0a2-ff87-78cd-816a-289d13dfdc14" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019cb0a2-ff87-749f-a40b-2f08b90d1d6e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_019cb0a2-ff87-77ed-ba98-6c36764763f3" 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_019cb0a2-ff87-78cd-816a-289d13dfdc14" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_019cb0a2-ff87-77ed-ba98-6c36764763f3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_019cb0a2-ff87-72c3-b13a-0c0a4ad653ee" 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_019cb0a2-ff87-78cd-816a-289d13dfdc14" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_019cb0a2-ff87-72c3-b13a-0c0a4ad653ee" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_019d3e43-5318-7838-a732-6f23e3778746" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019cb0a2-ff87-78cd-816a-289d13dfdc14" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_019d3e43-5318-7838-a732-6f23e3778746" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedIncomeTaxesNoncurrent_019cb0a2-ff87-7844-99a6-c519f4ebca3f" 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_019cb0a2-ff87-78cd-816a-289d13dfdc14" xlink:to="loc_us-gaap_AccruedIncomeTaxesNoncurrent_019cb0a2-ff87-7844-99a6-c519f4ebca3f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_019cb0a2-ff87-7279-83cf-a25d2dcbc8eb" 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_019cb0a2-ff87-78cd-816a-289d13dfdc14" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_019cb0a2-ff87-7279-83cf-a25d2dcbc8eb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019cb0a2-ff87-7749-bb70-00bedcfb48f3" 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_019cb0a2-ff87-78cd-816a-289d13dfdc14" xlink:to="loc_us-gaap_Liabilities_019cb0a2-ff87-7749-bb70-00bedcfb48f3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_019cb0a2-ff87-77eb-b9b4-dce6d6cebbda" 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_019cb0a2-ff87-78cd-816a-289d13dfdc14" xlink:to="loc_us-gaap_CommitmentsAndContingencies_019cb0a2-ff87-77eb-b9b4-dce6d6cebbda" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019cb0a2-ff87-7deb-a212-41a18d20689a" 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_019cb0a2-ff87-78cd-816a-289d13dfdc14" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_019cb0a2-ff87-7deb-a212-41a18d20689a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_019cb0a2-ff87-7e9a-b546-cafd7c41b6b2" 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_019cb0a2-ff87-7deb-a212-41a18d20689a" xlink:to="loc_us-gaap_PreferredStockValue_019cb0a2-ff87-7e9a-b546-cafd7c41b6b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_019cb0a2-ff87-76c6-9798-0c5a47d4145a" 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_019cb0a2-ff87-7deb-a212-41a18d20689a" xlink:to="loc_us-gaap_CommonStockValue_019cb0a2-ff87-76c6-9798-0c5a47d4145a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_019cb0a2-ff87-7068-bbde-31069bce64cc" 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_019cb0a2-ff87-7deb-a212-41a18d20689a" xlink:to="loc_us-gaap_AdditionalPaidInCapital_019cb0a2-ff87-7068-bbde-31069bce64cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019cb0a2-ff87-7c31-ad77-dd27db54eaa6" 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_019cb0a2-ff87-7deb-a212-41a18d20689a" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019cb0a2-ff87-7c31-ad77-dd27db54eaa6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019cb0a2-ff87-7675-bbfe-9dd96a4f2e7d" 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_019cb0a2-ff87-7deb-a212-41a18d20689a" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019cb0a2-ff87-7675-bbfe-9dd96a4f2e7d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019cb0a2-ff87-7bb8-a538-01157e0cded7" 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_019cb0a2-ff87-7deb-a212-41a18d20689a" xlink:to="loc_us-gaap_StockholdersEquity_019cb0a2-ff87-7bb8-a538-01157e0cded7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019cb0a2-ff87-7b00-8b8f-c1025be228aa" 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_019cb0a2-ff87-78cd-816a-289d13dfdc14" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_019cb0a2-ff87-7b00-8b8f-c1025be228aa" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSParentheticals" xlink:type="simple" xlink:href="soun-20260331.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_019cb0a2-ff87-74e8-ab57-d059364311ae" 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_019cb0a2-ff87-7306-92ae-a8c20ec0a1a8" 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_019cb0a2-ff87-74e8-ab57-d059364311ae" xlink:to="loc_us-gaap_StatementTable_019cb0a2-ff87-7306-92ae-a8c20ec0a1a8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019cb0a2-ff87-73f4-9fdf-b7bcaa9a1463" 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_019cb0a2-ff87-7306-92ae-a8c20ec0a1a8" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019cb0a2-ff87-73f4-9fdf-b7bcaa9a1463" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb0a2-ff87-73f4-9fdf-b7bcaa9a1463_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_019cb0a2-ff87-73f4-9fdf-b7bcaa9a1463" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb0a2-ff87-73f4-9fdf-b7bcaa9a1463_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb0a2-ff87-7f16-9443-b229713d044c" 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_019cb0a2-ff87-73f4-9fdf-b7bcaa9a1463" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb0a2-ff87-7f16-9443-b229713d044c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019cb0a2-ff87-7ba1-8551-794009b51b1e" 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_019cb0a2-ff87-7f16-9443-b229713d044c" xlink:to="loc_us-gaap_CommonClassAMember_019cb0a2-ff87-7ba1-8551-794009b51b1e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019cb0a2-ff87-7fdb-914f-f4df96d8e841" 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_019cb0a2-ff87-7f16-9443-b229713d044c" xlink:to="loc_us-gaap_CommonClassBMember_019cb0a2-ff87-7fdb-914f-f4df96d8e841" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_019cb0a2-ff87-7314-ae37-e0b1f5de491c" 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_019cb0a2-ff87-74e8-ab57-d059364311ae" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_019cb0a2-ff87-7314-ae37-e0b1f5de491c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_019cb0a2-ff87-784b-9a32-be5cddb3ae12" 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_019cb0a2-ff87-74e8-ab57-d059364311ae" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_019cb0a2-ff87-784b-9a32-be5cddb3ae12" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_019cb0a2-ff87-7df6-a248-a656f8df0af3" 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_019cb0a2-ff87-74e8-ab57-d059364311ae" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_019cb0a2-ff87-7df6-a248-a656f8df0af3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_019cb0a2-ff87-7287-8142-ea34eb210f3b" 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_019cb0a2-ff87-74e8-ab57-d059364311ae" xlink:to="loc_us-gaap_PreferredStockSharesIssued_019cb0a2-ff87-7287-8142-ea34eb210f3b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_019cb0a2-ff87-739a-b8aa-ab826592a3a6" 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_019cb0a2-ff87-74e8-ab57-d059364311ae" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_019cb0a2-ff87-739a-b8aa-ab826592a3a6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockLiquidationPreferenceValue_019cb0a2-ff87-7c84-9da8-ee61b85af5d3" 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_019cb0a2-ff87-74e8-ab57-d059364311ae" xlink:to="loc_us-gaap_PreferredStockLiquidationPreferenceValue_019cb0a2-ff87-7c84-9da8-ee61b85af5d3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_019cb0a2-ff87-7c74-b4ee-904019ee2e86" 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_019cb0a2-ff87-74e8-ab57-d059364311ae" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_019cb0a2-ff87-7c74-b4ee-904019ee2e86" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_019cb0a2-ff87-753f-b89a-2266dccc56cb" 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_019cb0a2-ff87-74e8-ab57-d059364311ae" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_019cb0a2-ff87-753f-b89a-2266dccc56cb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_019cb0a2-ff87-7326-ab2b-b3e2a2a5d1cd" 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_019cb0a2-ff87-74e8-ab57-d059364311ae" xlink:to="loc_us-gaap_CommonStockSharesIssued_019cb0a2-ff87-7326-ab2b-b3e2a2a5d1cd" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019cb0a2-ff87-7f3f-b9e0-a1fc39c81691" 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_019cb0a2-ff87-74e8-ab57-d059364311ae" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019cb0a2-ff87-7f3f-b9e0-a1fc39c81691" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITY" xlink:type="simple" xlink:href="soun-20260331.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_019cb0a2-ff87-7a08-8352-559b5f4dfe17" 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_019cb0a2-ff87-7e24-8190-b6734a57edf2" 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_019cb0a2-ff87-7a08-8352-559b5f4dfe17" xlink:to="loc_us-gaap_StatementTable_019cb0a2-ff87-7e24-8190-b6734a57edf2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019cb0a2-ff87-7e07-a4ac-e65952c829c1" 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_019cb0a2-ff87-7e24-8190-b6734a57edf2" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019cb0a2-ff87-7e07-a4ac-e65952c829c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019cb0a2-ff87-7e07-a4ac-e65952c829c1_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_019cb0a2-ff87-7e07-a4ac-e65952c829c1" xlink:to="loc_us-gaap_EquityComponentDomain_019cb0a2-ff87-7e07-a4ac-e65952c829c1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019cb0a2-ff87-7c52-b2dd-474fde5a9077" 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_019cb0a2-ff87-7e07-a4ac-e65952c829c1" xlink:to="loc_us-gaap_EquityComponentDomain_019cb0a2-ff87-7c52-b2dd-474fde5a9077" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_019cb0a2-ff87-7b53-a4f5-6680d229cec8" 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_019cb0a2-ff87-7c52-b2dd-474fde5a9077" xlink:to="loc_us-gaap_PreferredStockMember_019cb0a2-ff87-7b53-a4f5-6680d229cec8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019cb0a2-ff87-7a32-905c-0671731c36db" 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_019cb0a2-ff87-7c52-b2dd-474fde5a9077" xlink:to="loc_us-gaap_CommonStockMember_019cb0a2-ff87-7a32-905c-0671731c36db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019cb0a2-ff87-7a6a-a2de-a32ecd31c510" 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_019cb0a2-ff87-7c52-b2dd-474fde5a9077" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019cb0a2-ff87-7a6a-a2de-a32ecd31c510" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019cb0a2-ff87-7e21-a7e0-9f9f5dbe568f" 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_019cb0a2-ff87-7c52-b2dd-474fde5a9077" xlink:to="loc_us-gaap_RetainedEarningsMember_019cb0a2-ff87-7e21-a7e0-9f9f5dbe568f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019cb0a2-ff87-7e77-aba3-09f63a90c8c6" 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_019cb0a2-ff87-7c52-b2dd-474fde5a9077" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019cb0a2-ff87-7e77-aba3-09f63a90c8c6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019cb0a2-ff87-72bd-8a80-ae9075e7d503" 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_019cb0a2-ff87-7e24-8190-b6734a57edf2" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019cb0a2-ff87-72bd-8a80-ae9075e7d503" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb0a2-ff87-72bd-8a80-ae9075e7d503_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_019cb0a2-ff87-72bd-8a80-ae9075e7d503" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb0a2-ff87-72bd-8a80-ae9075e7d503_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb0a2-ff87-7e46-8950-c8dd49c4e371" 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_019cb0a2-ff87-72bd-8a80-ae9075e7d503" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb0a2-ff87-7e46-8950-c8dd49c4e371" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019cb0a2-ff87-71e1-b482-093457294229" 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_019cb0a2-ff87-7e46-8950-c8dd49c4e371" xlink:to="loc_us-gaap_CommonClassAMember_019cb0a2-ff87-71e1-b482-093457294229" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019cb0a2-ff87-7cd9-a566-21492f09620f" 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_019cb0a2-ff87-7e46-8950-c8dd49c4e371" xlink:to="loc_us-gaap_CommonClassBMember_019cb0a2-ff87-7cd9-a566-21492f09620f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cb0a2-ff87-735e-9191-61ca99795a66" 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_019cb0a2-ff87-7a08-8352-559b5f4dfe17" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cb0a2-ff87-735e-9191-61ca99795a66" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_019cb0a2-ff87-7d1d-9eb1-c9495955b3e2" 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_019cb0a2-ff87-735e-9191-61ca99795a66" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_019cb0a2-ff87-7d1d-9eb1-c9495955b3e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019cb0a2-ff87-7859-9ec3-7ea4b250e22e" 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_019cb0a2-ff87-735e-9191-61ca99795a66" xlink:to="loc_us-gaap_StockholdersEquity_019cb0a2-ff87-7859-9ec3-7ea4b250e22e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019cb0a2-ff87-7080-9229-44e56f23677d" 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_019cb0a2-ff87-735e-9191-61ca99795a66" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019cb0a2-ff87-7080-9229-44e56f23677d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019cb0a2-ff87-7470-83bc-25f718da35d3" 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_019cb0a2-ff87-735e-9191-61ca99795a66" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019cb0a2-ff87-7470-83bc-25f718da35d3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019cb0a2-ff87-7db9-aec7-a1bf7bb6afdd" 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_019cb0a2-ff87-735e-9191-61ca99795a66" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019cb0a2-ff87-7db9-aec7-a1bf7bb6afdd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019cb0a2-ff87-711b-83b1-ee4c675eb746" 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_019cb0a2-ff87-735e-9191-61ca99795a66" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019cb0a2-ff87-711b-83b1-ee4c675eb746" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_019cb0a2-ff87-7d60-b8ca-8bd8ca98ed93" 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_019cb0a2-ff87-735e-9191-61ca99795a66" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_019cb0a2-ff87-7d60-b8ca-8bd8ca98ed93" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_019cb0a2-ff87-7d01-b169-ae1062af2b79" 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_019cb0a2-ff87-735e-9191-61ca99795a66" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_019cb0a2-ff87-7d01-b169-ae1062af2b79" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_019cb0a2-ff87-751d-80a5-8c682199096a" 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_019cb0a2-ff87-735e-9191-61ca99795a66" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_019cb0a2-ff87-751d-80a5-8c682199096a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019cb0a2-ff87-73b4-b469-8d5954ed62d2" 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_019cb0a2-ff87-735e-9191-61ca99795a66" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019cb0a2-ff87-73b4-b469-8d5954ed62d2" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019cb0a2-ff87-75a5-905d-5e8a0ceed452" 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_019cb0a2-ff87-735e-9191-61ca99795a66" xlink:to="loc_us-gaap_NetIncomeLoss_019cb0a2-ff87-75a5-905d-5e8a0ceed452" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019cb0a2-ff87-7198-b982-cb6bf9a5910c" 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_019cb0a2-ff87-735e-9191-61ca99795a66" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019cb0a2-ff87-7198-b982-cb6bf9a5910c" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_019cb0a2-ff87-7116-b009-7eaf078b9d7b" 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_019cb0a2-ff87-73b4-8fa7-0b846771d2b7" 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_019cb0a2-ff87-7aac-9294-9a1209e75fb3" 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-20260331.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_019cb0a2-ff87-7a4e-b69d-5f6148f270db" 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_019cb0a2-ff87-7a57-b485-6ea7a1f9385a" 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_019cb0a2-ff87-7a4e-b69d-5f6148f270db" xlink:to="loc_us-gaap_NoncashOrPartNoncashAcquisitionsTable_019cb0a2-ff87-7a57-b485-6ea7a1f9385a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis_019cb0a2-ff87-7f71-bc5e-97f449438dc1" 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_019cb0a2-ff87-7a57-b485-6ea7a1f9385a" xlink:to="loc_us-gaap_OtherSignificantNoncashTransactionsByUniqueDescriptionAxis_019cb0a2-ff87-7f71-bc5e-97f449438dc1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSignificantNoncashTransactionNameDomain_019cb0a2-ff87-7f71-bc5e-97f449438dc1_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_019cb0a2-ff87-7f71-bc5e-97f449438dc1" xlink:to="loc_us-gaap_OtherSignificantNoncashTransactionNameDomain_019cb0a2-ff87-7f71-bc5e-97f449438dc1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSignificantNoncashTransactionNameDomain_019cb0a2-ff87-75f6-af77-1102678d4b36" 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_019cb0a2-ff87-7f71-bc5e-97f449438dc1" xlink:to="loc_us-gaap_OtherSignificantNoncashTransactionNameDomain_019cb0a2-ff87-75f6-af77-1102678d4b36" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SettleContigentHoldbackConsiderationOfSYNQ3AcquisitionMemberMember_019cb0a2-ff87-7830-ae03-46f1ef1ecb85" xlink:href="soun-20260331.xsd#soun_SettleContigentHoldbackConsiderationOfSYNQ3AcquisitionMemberMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherSignificantNoncashTransactionNameDomain_019cb0a2-ff87-75f6-af77-1102678d4b36" xlink:to="loc_soun_SettleContigentHoldbackConsiderationOfSYNQ3AcquisitionMemberMember_019cb0a2-ff87-7830-ae03-46f1ef1ecb85" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability_019dccd8-b614-7a77-8c78-81d99e573f1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionsLineItems_019cb0a2-ff87-7a4e-b69d-5f6148f270db" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability_019dccd8-b614-7a77-8c78-81d99e573f1e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssued1_019cb0a2-ff87-78a6-9178-013cfd573355" 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_019cb0a2-ff87-7a4e-b69d-5f6148f270db" xlink:to="loc_us-gaap_StockIssued1_019cb0a2-ff87-78a6-9178-013cfd573355" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_DeferredOfferingCostsReclassifiedToAdditionalPaidInCapital_019cb0a2-ff87-77c4-b5cd-8517c142e058" xlink:href="soun-20260331.xsd#soun_DeferredOfferingCostsReclassifiedToAdditionalPaidInCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionsLineItems_019cb0a2-ff87-7a4e-b69d-5f6148f270db" xlink:to="loc_soun_DeferredOfferingCostsReclassifiedToAdditionalPaidInCapital_019cb0a2-ff87-77c4-b5cd-8517c142e058" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_StockBasedCompensationIncludedInCapitalizedSoftwareDevelopmentCosts_019cb0a2-ff87-74b3-b55b-ce7df7b9c227" xlink:href="soun-20260331.xsd#soun_StockBasedCompensationIncludedInCapitalizedSoftwareDevelopmentCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionsLineItems_019cb0a2-ff87-7a4e-b69d-5f6148f270db" xlink:to="loc_soun_StockBasedCompensationIncludedInCapitalizedSoftwareDevelopmentCosts_019cb0a2-ff87-74b3-b55b-ce7df7b9c227" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/BASISOFPRESENTATIONANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESDetails" xlink:type="simple" xlink:href="soun-20260331.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_019cb0a2-ff87-7791-adbd-0be475a3d14c" 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_019cb0a2-ff87-7107-9734-896bc6cc2380" 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_019cb0a2-ff87-7791-adbd-0be475a3d14c" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019cb0a2-ff87-7107-9734-896bc6cc2380" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019cb0a2-ff87-727b-b126-e6edf6ac1b81" 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_019cb0a2-ff87-7107-9734-896bc6cc2380" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019cb0a2-ff87-727b-b126-e6edf6ac1b81" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019cb0a2-ff87-727b-b126-e6edf6ac1b81_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_019cb0a2-ff87-727b-b126-e6edf6ac1b81" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019cb0a2-ff87-727b-b126-e6edf6ac1b81_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019cb0a2-ff87-7aaf-945a-bc9b71a65423" 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_019cb0a2-ff87-727b-b126-e6edf6ac1b81" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019cb0a2-ff87-7aaf-945a-bc9b71a65423" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_019cb0a2-ff87-77c7-b394-40c9721dbaa3" 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_019cb0a2-ff87-7aaf-945a-bc9b71a65423" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_019cb0a2-ff87-77c7-b394-40c9721dbaa3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_019cb0a2-ff87-71b4-8204-8687f0eb7265" 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_019cb0a2-ff87-7107-9734-896bc6cc2380" xlink:to="loc_srt_MajorCustomersAxis_019cb0a2-ff87-71b4-8204-8687f0eb7265" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019cb0a2-ff87-71b4-8204-8687f0eb7265_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_019cb0a2-ff87-71b4-8204-8687f0eb7265" xlink:to="loc_srt_NameOfMajorCustomerDomain_019cb0a2-ff87-71b4-8204-8687f0eb7265_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019cb0a2-ff87-7ead-9f2c-5e72df796549" 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_019cb0a2-ff87-71b4-8204-8687f0eb7265" xlink:to="loc_srt_NameOfMajorCustomerDomain_019cb0a2-ff87-7ead-9f2c-5e72df796549" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_CustomerAMember_019dccd9-d1f2-7051-a739-1883a8b62336" xlink:href="soun-20260331.xsd#soun_CustomerAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019cb0a2-ff87-7ead-9f2c-5e72df796549" xlink:to="loc_soun_CustomerAMember_019dccd9-d1f2-7051-a739-1883a8b62336" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_CustomerBMember_019cb0a2-ff87-79a6-80b2-f601b32cb3cd" xlink:href="soun-20260331.xsd#soun_CustomerBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019cb0a2-ff87-7ead-9f2c-5e72df796549" xlink:to="loc_soun_CustomerBMember_019cb0a2-ff87-79a6-80b2-f601b32cb3cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_CustomerCMember_019cb0a2-ff87-7d09-8d65-9b4cde08f58d" xlink:href="soun-20260331.xsd#soun_CustomerCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019cb0a2-ff87-7ead-9f2c-5e72df796549" xlink:to="loc_soun_CustomerCMember_019cb0a2-ff87-7d09-8d65-9b4cde08f58d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_CustomerDMember_019cb0a2-ff87-7eff-ae9a-e27bbfe30a4f" xlink:href="soun-20260331.xsd#soun_CustomerDMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019cb0a2-ff87-7ead-9f2c-5e72df796549" xlink:to="loc_soun_CustomerDMember_019cb0a2-ff87-7eff-ae9a-e27bbfe30a4f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_CustomerEMember_019cb0a2-ff87-7ee0-b938-39901370bc42" xlink:href="soun-20260331.xsd#soun_CustomerEMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019cb0a2-ff87-7ead-9f2c-5e72df796549" xlink:to="loc_soun_CustomerEMember_019cb0a2-ff87-7ee0-b938-39901370bc42" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cb0a2-ff87-7111-8523-ddaab11233e4" 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_019cb0a2-ff87-7107-9734-896bc6cc2380" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cb0a2-ff87-7111-8523-ddaab11233e4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cb0a2-ff87-7111-8523-ddaab11233e4_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_019cb0a2-ff87-7111-8523-ddaab11233e4" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cb0a2-ff87-7111-8523-ddaab11233e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cb0a2-ff87-749b-b21b-6a5a6cbff107" 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_019cb0a2-ff87-7111-8523-ddaab11233e4" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cb0a2-ff87-749b-b21b-6a5a6cbff107" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_UnbilledReceivablesMember_019cb0a2-ff87-7cc2-9a2d-176923aadaed" xlink:href="soun-20260331.xsd#soun_UnbilledReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cb0a2-ff87-749b-b21b-6a5a6cbff107" xlink:to="loc_soun_UnbilledReceivablesMember_019cb0a2-ff87-7cc2-9a2d-176923aadaed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019cb0a2-ff87-7bc1-bd1c-a6e6882faff4" 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_019cb0a2-ff87-7791-adbd-0be475a3d14c" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019cb0a2-ff87-7bc1-bd1c-a6e6882faff4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_019cb0a2-ff87-7c26-80a1-f08b0b5f3a0a" 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_019cb0a2-ff87-7791-adbd-0be475a3d14c" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_019cb0a2-ff87-7c26-80a1-f08b0b5f3a0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill_019cb0a2-ff87-7e09-9c50-22c70466fde7" 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_019cb0a2-ff87-7791-adbd-0be475a3d14c" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill_019cb0a2-ff87-7e09-9c50-22c70466fde7" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/BUSINESSCOMBINATIONSNarrativeDetails" xlink:type="simple" xlink:href="soun-20260331.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_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" 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_019cb0a2-ff87-75de-a8c3-02fa14d1e267" 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_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_us-gaap_BusinessCombinationSegmentAllocationTable_019cb0a2-ff87-75de-a8c3-02fa14d1e267" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019cb0a2-ff87-7834-a674-79db698ee57f" 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_019cb0a2-ff87-75de-a8c3-02fa14d1e267" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019cb0a2-ff87-7834-a674-79db698ee57f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a2-ff87-7834-a674-79db698ee57f_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_019cb0a2-ff87-7834-a674-79db698ee57f" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a2-ff87-7834-a674-79db698ee57f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a2-ff87-764e-8660-d8cfde7bda94" 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_019cb0a2-ff87-7834-a674-79db698ee57f" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a2-ff87-764e-8660-d8cfde7bda94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SYNQ3IncMember_019d3f8e-40d2-75e7-9130-731f0fe81ccc" xlink:href="soun-20260331.xsd#soun_SYNQ3IncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a2-ff87-764e-8660-d8cfde7bda94" xlink:to="loc_soun_SYNQ3IncMember_019d3f8e-40d2-75e7-9130-731f0fe81ccc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_AmeliaTechnologiesLLCMember_019cb0a2-ff87-75d2-b607-a55e3dbcb0fa" xlink:href="soun-20260331.xsd#soun_AmeliaTechnologiesLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a2-ff87-764e-8660-d8cfde7bda94" xlink:to="loc_soun_AmeliaTechnologiesLLCMember_019cb0a2-ff87-75d2-b607-a55e3dbcb0fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_InteractionsCorporationMember_019cb0a2-ff87-7b6a-be60-d4d6915c9fcc" xlink:href="soun-20260331.xsd#soun_InteractionsCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a2-ff87-764e-8660-d8cfde7bda94" xlink:to="loc_soun_InteractionsCorporationMember_019cb0a2-ff87-7b6a-be60-d4d6915c9fcc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_019cb0a2-ff87-7ad3-b5cc-039a1a27bb09" 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_019cb0a2-ff87-75de-a8c3-02fa14d1e267" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_019cb0a2-ff87-7ad3-b5cc-039a1a27bb09" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a2-ff87-7ad3-b5cc-039a1a27bb09_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_019cb0a2-ff87-7ad3-b5cc-039a1a27bb09" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a2-ff87-7ad3-b5cc-039a1a27bb09_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a2-ff87-7da5-a4fa-f46e5341d60e" 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_019cb0a2-ff87-7ad3-b5cc-039a1a27bb09" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a2-ff87-7da5-a4fa-f46e5341d60e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationHoldbackLiabilityMember_019cb0a2-ff87-72ba-b6ed-f001bcb55dc8" xlink:href="soun-20260331.xsd#soun_ContingentConsiderationHoldbackLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a2-ff87-7da5-a4fa-f46e5341d60e" xlink:to="loc_soun_ContingentConsiderationHoldbackLiabilityMember_019cb0a2-ff87-72ba-b6ed-f001bcb55dc8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationEarnoutLiabilityMember_019cb0a2-ff87-7c35-a960-7295dcd520b8" xlink:href="soun-20260331.xsd#soun_ContingentConsiderationEarnoutLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a2-ff87-7da5-a4fa-f46e5341d60e" xlink:to="loc_soun_ContingentConsiderationEarnoutLiabilityMember_019cb0a2-ff87-7c35-a960-7295dcd520b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_UpfrontConsiderationMember_019cb0a2-ff87-75f2-afed-3a52358e08b6" xlink:href="soun-20260331.xsd#soun_UpfrontConsiderationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a2-ff87-7da5-a4fa-f46e5341d60e" xlink:to="loc_soun_UpfrontConsiderationMember_019cb0a2-ff87-75f2-afed-3a52358e08b6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_EscrowConsiderationWithholdingMember_019cb0a2-ff87-75f2-a849-6e414d22b631" xlink:href="soun-20260331.xsd#soun_EscrowConsiderationWithholdingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a2-ff87-7da5-a4fa-f46e5341d60e" xlink:to="loc_soun_EscrowConsiderationWithholdingMember_019cb0a2-ff87-75f2-a849-6e414d22b631" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_UpfrontPurchaseConsiderationMember_019cb0a2-ff87-723f-8824-4086ae080707" xlink:href="soun-20260331.xsd#soun_UpfrontPurchaseConsiderationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a2-ff87-7da5-a4fa-f46e5341d60e" xlink:to="loc_soun_UpfrontPurchaseConsiderationMember_019cb0a2-ff87-723f-8824-4086ae080707" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationDeferredHoldbackMember_019cb0a2-ff87-7b9d-8c87-8870a752dae1" xlink:href="soun-20260331.xsd#soun_ContingentConsiderationDeferredHoldbackMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a2-ff87-7da5-a4fa-f46e5341d60e" xlink:to="loc_soun_ContingentConsiderationDeferredHoldbackMember_019cb0a2-ff87-7b9d-8c87-8870a752dae1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationAdjustmentHoldbackMember_019cb0a2-ff87-7c55-9d59-bbce218714e9" xlink:href="soun-20260331.xsd#soun_ContingentConsiderationAdjustmentHoldbackMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a2-ff87-7da5-a4fa-f46e5341d60e" xlink:to="loc_soun_ContingentConsiderationAdjustmentHoldbackMember_019cb0a2-ff87-7c55-9d59-bbce218714e9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationIndemnityHoldbackMember_019cb0a2-ff87-7a12-afef-c8531ec7182c" xlink:href="soun-20260331.xsd#soun_ContingentConsiderationIndemnityHoldbackMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a2-ff87-7da5-a4fa-f46e5341d60e" xlink:to="loc_soun_ContingentConsiderationIndemnityHoldbackMember_019cb0a2-ff87-7a12-afef-c8531ec7182c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_019cb0a2-ff87-775b-8f46-bfcb7d927f25" 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_019cb0a2-ff87-75de-a8c3-02fa14d1e267" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_019cb0a2-ff87-775b-8f46-bfcb7d927f25" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_019cb0a2-ff87-775b-8f46-bfcb7d927f25_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_019cb0a2-ff87-775b-8f46-bfcb7d927f25" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_019cb0a2-ff87-775b-8f46-bfcb7d927f25_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_019cb0a2-ff87-7a91-b6b6-2fd036fb2803" 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_019cb0a2-ff87-775b-8f46-bfcb7d927f25" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_019cb0a2-ff87-7a91-b6b6-2fd036fb2803" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_019cb0a2-ff87-769e-9f3d-2575133df0f5" 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_019cb0a2-ff87-7a91-b6b6-2fd036fb2803" xlink:to="loc_us-gaap_RestrictedStockMember_019cb0a2-ff87-769e-9f3d-2575133df0f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019cb0a2-ff87-7a3f-8d24-27b2b4633992" 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_019cb0a2-ff87-7a91-b6b6-2fd036fb2803" xlink:to="loc_us-gaap_CommonStockMember_019cb0a2-ff87-7a3f-8d24-27b2b4633992" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019cb0a2-ff87-7454-84e0-b855ca73a81a" 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_019cb0a2-ff87-75de-a8c3-02fa14d1e267" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019cb0a2-ff87-7454-84e0-b855ca73a81a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb0a2-ff87-7454-84e0-b855ca73a81a_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_019cb0a2-ff87-7454-84e0-b855ca73a81a" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb0a2-ff87-7454-84e0-b855ca73a81a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb0a2-ff87-725f-8fcc-4eaffbd47e34" 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_019cb0a2-ff87-7454-84e0-b855ca73a81a" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb0a2-ff87-725f-8fcc-4eaffbd47e34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019cb0a2-ff87-7b7f-a6e6-6befd9369b67" 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_019cb0a2-ff87-725f-8fcc-4eaffbd47e34" xlink:to="loc_us-gaap_CommonClassAMember_019cb0a2-ff87-7b7f-a6e6-6befd9369b67" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_019cb0a2-ff87-7745-9f8e-f3750fd64eae" 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_019cb0a2-ff87-75de-a8c3-02fa14d1e267" xlink:to="loc_srt_TitleOfIndividualAxis_019cb0a2-ff87-7745-9f8e-f3750fd64eae" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019cb0a2-ff87-7745-9f8e-f3750fd64eae_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_019cb0a2-ff87-7745-9f8e-f3750fd64eae" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019cb0a2-ff87-7745-9f8e-f3750fd64eae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019cb0a2-ff87-71ca-a12b-6ffe068c9654" 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_019cb0a2-ff87-7745-9f8e-f3750fd64eae" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019cb0a2-ff87-71ca-a12b-6ffe068c9654" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ExecutiveOfficerMember_019cb0a2-ff87-7497-ab7e-ed86dcbc6f68" 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_019cb0a2-ff87-71ca-a12b-6ffe068c9654" xlink:to="loc_srt_ExecutiveOfficerMember_019cb0a2-ff87-7497-ab7e-ed86dcbc6f68" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019cb0a2-ff87-71e2-a169-417969a46d4c" 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_019cb0a2-ff87-75de-a8c3-02fa14d1e267" xlink:to="loc_srt_CounterpartyNameAxis_019cb0a2-ff87-71e2-a169-417969a46d4c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019cb0a2-ff87-71e2-a169-417969a46d4c_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_019cb0a2-ff87-71e2-a169-417969a46d4c" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019cb0a2-ff87-71e2-a169-417969a46d4c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019cb0a2-ff87-74ed-aaeb-5e0c9aada92a" 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_019cb0a2-ff87-71e2-a169-417969a46d4c" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019cb0a2-ff87-74ed-aaeb-5e0c9aada92a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_InteractionAcquisitionSellingShareholdersMember_019cb0a2-ff87-7dbc-aeb8-27bb9a656f9c" xlink:href="soun-20260331.xsd#soun_InteractionAcquisitionSellingShareholdersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019cb0a2-ff87-74ed-aaeb-5e0c9aada92a" xlink:to="loc_soun_InteractionAcquisitionSellingShareholdersMember_019cb0a2-ff87-7dbc-aeb8-27bb9a656f9c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019cb0a2-ff87-7732-9b46-4abb53f4088d" 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_019cb0a2-ff87-75de-a8c3-02fa14d1e267" xlink:to="loc_us-gaap_AwardTypeAxis_019cb0a2-ff87-7732-9b46-4abb53f4088d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cb0a2-ff87-7732-9b46-4abb53f4088d_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_019cb0a2-ff87-7732-9b46-4abb53f4088d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cb0a2-ff87-7732-9b46-4abb53f4088d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cb0a2-ff87-7dde-bbb2-11eed429f2a3" 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_019cb0a2-ff87-7732-9b46-4abb53f4088d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cb0a2-ff87-7dde-bbb2-11eed429f2a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_UnvestedRestrictedStockMember_019cb0a2-ff87-79a0-ab80-3657273813f4" xlink:href="soun-20260331.xsd#soun_UnvestedRestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cb0a2-ff87-7dde-bbb2-11eed429f2a3" xlink:to="loc_soun_UnvestedRestrictedStockMember_019cb0a2-ff87-79a0-ab80-3657273813f4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019dcce2-3757-7510-afe4-4ad75c4353cf" 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_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019dcce2-3757-7510-afe4-4ad75c4353cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_019dcce2-3757-739e-a34a-a82fcc9aa8ca" 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_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_019dcce2-3757-739e-a34a-a82fcc9aa8ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_019dcce2-3757-7e02-8ec3-bbadeae1d869" 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_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_019dcce2-3757-7e02-8ec3-bbadeae1d869" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019dcce2-3757-7f86-862c-e4eabcd10eab" 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_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019dcce2-3757-7f86-862c-e4eabcd10eab" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_019dcce2-3757-7031-929c-8b020d557bc4" 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_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_019dcce2-3757-7031-929c-8b020d557bc4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesSharesHigh_019dcce2-3757-75de-bcc6-c3f67ec1da2e" xlink:href="soun-20260331.xsd#soun_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesSharesHigh"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_soun_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesSharesHigh_019dcce2-3757-75de-bcc6-c3f67ec1da2e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationConsiderationIndemnificationPeriod_019dcce2-3757-7314-b0b8-e1557df554ff" xlink:href="soun-20260331.xsd#soun_BusinessCombinationConsiderationIndemnificationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_soun_BusinessCombinationConsiderationIndemnificationPeriod_019dcce2-3757-7314-b0b8-e1557df554ff" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_019dcce2-3757-737f-9e34-f59950a658bd" 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_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_019dcce2-3757-737f-9e34-f59950a658bd" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_019dcce2-3757-7afa-ab0b-5c26026675e8" 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_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_019dcce2-3757-7afa-ab0b-5c26026675e8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019dcce2-3757-764b-962e-df616a5e0795" 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_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019dcce2-3757-764b-962e-df616a5e0795" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationContingentConsiderationShares_019dcce2-6da7-751e-9a3d-775ff614adaf" xlink:href="soun-20260331.xsd#soun_BusinessCombinationContingentConsiderationShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_soun_BusinessCombinationContingentConsiderationShares_019dcce2-6da7-751e-9a3d-775ff614adaf" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationIndemnificationAssetsAmountAsOfAcquisitionDate_019dcce2-6da7-7152-8bad-5e5a6417acc7" 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_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_us-gaap_BusinessCombinationIndemnificationAssetsAmountAsOfAcquisitionDate_019dcce2-6da7-7152-8bad-5e5a6417acc7" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionSharePrice_019dcce2-6da7-7e8e-b72d-f9e3dd272511" 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_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_us-gaap_BusinessAcquisitionSharePrice_019dcce2-6da7-7e8e-b72d-f9e3dd272511" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsIncreaseDecreaseInAccruedLiabilities_019df10a-c7c5-7803-90b4-4736d7aa46bf" xlink:href="soun-20260331.xsd#soun_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsIncreaseDecreaseInAccruedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_soun_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsIncreaseDecreaseInAccruedLiabilities_019df10a-c7c5-7803-90b4-4736d7aa46bf" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsCurrentLiabilitiesOther_019df10a-c7c5-7b38-8ca3-cbd0e4f75874" xlink:href="soun-20260331.xsd#soun_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsCurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_soun_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsCurrentLiabilitiesOther_019df10a-c7c5-7b38-8ca3-cbd0e4f75874" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_019df10a-c7c5-7c04-95e6-9b1e5762481e" 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_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_019df10a-c7c5-7c04-95e6-9b1e5762481e" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForMergerRelatedCosts_019dcce2-9fb2-7f81-b2cb-806222b34098" 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_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_us-gaap_PaymentsForMergerRelatedCosts_019dcce2-9fb2-7f81-b2cb-806222b34098" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_019dcce2-9fb2-709a-bdec-e008bfd24050" 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_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_019dcce2-9fb2-709a-bdec-e008bfd24050" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019dcce2-9fb2-76a4-8f8b-4bd866add8eb" 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_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019dcce2-9fb2-76a4-8f8b-4bd866add8eb" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentForContingentConsiderationLiabilityInvestingActivities_019dcce2-9fb2-720a-9489-29a7ccfd29ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentForContingentConsiderationLiabilityInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSegmentAllocationLineItems_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_us-gaap_PaymentForContingentConsiderationLiabilityInvestingActivities_019dcce2-9fb2-720a-9489-29a7ccfd29ab" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019dcce2-ca98-72d6-b8f1-5b760ae27b8b" 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_019cb0a2-ff87-7bd0-9575-3f9a528acf0c" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019dcce2-ca98-72d6-b8f1-5b760ae27b8b" xlink:type="arc" order="20"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/BUSINESSCOMBINATIONSScheduleofPurchasePriceDetails" xlink:type="simple" xlink:href="soun-20260331.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_019d3faf-aba1-7121-a3b4-a064b5ba72b7" 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_019d3faf-aba1-760d-aec9-6e615d77cd4f" 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_019d3faf-aba1-7121-a3b4-a064b5ba72b7" xlink:to="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsTable_019d3faf-aba1-760d-aec9-6e615d77cd4f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019d3faf-aba1-7741-85a9-2230fb86e349" 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_019d3faf-aba1-760d-aec9-6e615d77cd4f" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019d3faf-aba1-7741-85a9-2230fb86e349" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d3faf-aba1-7741-85a9-2230fb86e349_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_019d3faf-aba1-7741-85a9-2230fb86e349" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d3faf-aba1-7741-85a9-2230fb86e349_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d3faf-aba1-7c0d-b100-3a1a3c9330cb" 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_019d3faf-aba1-7741-85a9-2230fb86e349" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d3faf-aba1-7c0d-b100-3a1a3c9330cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_InteractionsCorporationMember_019d3faf-aba1-78f7-b5d5-0d36d3a93c4b" xlink:href="soun-20260331.xsd#soun_InteractionsCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d3faf-aba1-7c0d-b100-3a1a3c9330cb" xlink:to="loc_soun_InteractionsCorporationMember_019d3faf-aba1-78f7-b5d5-0d36d3a93c4b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_019d3faf-aba1-7583-a440-3199c8623646" 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_019d3faf-aba1-760d-aec9-6e615d77cd4f" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_019d3faf-aba1-7583-a440-3199c8623646" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_019d3faf-aba1-7583-a440-3199c8623646_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_019d3faf-aba1-7583-a440-3199c8623646" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_019d3faf-aba1-7583-a440-3199c8623646_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_019d3faf-aba1-7e5c-a98b-9d43ab105f66" 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_019d3faf-aba1-7583-a440-3199c8623646" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_019d3faf-aba1-7e5c-a98b-9d43ab105f66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationDeferredHoldbackMember_019dcce5-3910-748a-ad1a-a1b9559dc8d6" xlink:href="soun-20260331.xsd#soun_ContingentConsiderationDeferredHoldbackMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019d3faf-aba1-7e5c-a98b-9d43ab105f66" xlink:to="loc_soun_ContingentConsiderationDeferredHoldbackMember_019dcce5-3910-748a-ad1a-a1b9559dc8d6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationEarnoutLiabilityMember_019d3faf-aba1-78af-a459-688e71d59e80" xlink:href="soun-20260331.xsd#soun_ContingentConsiderationEarnoutLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019d3faf-aba1-7e5c-a98b-9d43ab105f66" xlink:to="loc_soun_ContingentConsiderationEarnoutLiabilityMember_019d3faf-aba1-78af-a459-688e71d59e80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_019d3faf-aba1-72ce-a14c-d101238d013d" 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_019d3faf-aba1-7121-a3b4-a064b5ba72b7" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_019d3faf-aba1-72ce-a14c-d101238d013d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019d3faf-aba1-7acb-8724-5a2691108187" 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_019d3faf-aba1-7121-a3b4-a064b5ba72b7" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019d3faf-aba1-7acb-8724-5a2691108187" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019d3faf-aba1-7527-83e7-a22d86be7bc3" 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_019d3faf-aba1-7121-a3b4-a064b5ba72b7" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019d3faf-aba1-7527-83e7-a22d86be7bc3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019d3faf-aba1-7a50-a13d-4318f438dc06" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_019d3faf-aba1-7121-a3b4-a064b5ba72b7" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019d3faf-aba1-7a50-a13d-4318f438dc06" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_019d3faf-aba1-7cfa-a6d9-6a04d0dac27b" 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_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019d3faf-aba1-7a50-a13d-4318f438dc06" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_019d3faf-aba1-7cfa-a6d9-6a04d0dac27b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_019d3faf-aba1-792a-9a9d-20b8983ea925" 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_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019d3faf-aba1-7a50-a13d-4318f438dc06" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_019d3faf-aba1-792a-9a9d-20b8983ea925" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_019d3faf-aba1-7acf-a48c-6d53eb0d7f61" 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_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019d3faf-aba1-7a50-a13d-4318f438dc06" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_019d3faf-aba1-7acf-a48c-6d53eb0d7f61" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContractAssetAndUnbilledReceivableCurrent_019d3faf-aba1-70a0-a2e8-3166aaac8bdf" xlink:href="soun-20260331.xsd#soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContractAssetAndUnbilledReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019d3faf-aba1-7a50-a13d-4318f438dc06" xlink:to="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContractAssetAndUnbilledReceivableCurrent_019d3faf-aba1-70a0-a2e8-3166aaac8bdf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019d3faf-aba1-78cf-8ae8-499aef495818" 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_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019d3faf-aba1-7a50-a13d-4318f438dc06" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019d3faf-aba1-78cf-8ae8-499aef495818" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRightOfUseAssets_019d3faf-aba1-7cd3-a434-0deef5768cba" xlink:href="soun-20260331.xsd#soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRightOfUseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019d3faf-aba1-7a50-a13d-4318f438dc06" xlink:to="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRightOfUseAssets_019d3faf-aba1-7cd3-a434-0deef5768cba" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContractAssetAndUnbilledReceivableNonCurrent_019d3faf-aba1-769e-a8a0-e4f11d935785" xlink:href="soun-20260331.xsd#soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContractAssetAndUnbilledReceivableNonCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019d3faf-aba1-7a50-a13d-4318f438dc06" xlink:to="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContractAssetAndUnbilledReceivableNonCurrent_019d3faf-aba1-769e-a8a0-e4f11d935785" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019d3faf-aba1-7e67-b730-687d9a57c9e3" 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_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019d3faf-aba1-7a50-a13d-4318f438dc06" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019d3faf-aba1-7e67-b730-687d9a57c9e3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_019d3faf-aba1-7c91-b89e-73fdb16188a2" 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_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019d3faf-aba1-7a50-a13d-4318f438dc06" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_019d3faf-aba1-7c91-b89e-73fdb16188a2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_019d3faf-aba1-7536-8705-376d874e00c4" 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_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_019d3faf-aba1-7a50-a13d-4318f438dc06" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_019d3faf-aba1-7536-8705-376d874e00c4" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019d3faf-aba1-7fe6-adee-077dc2bdcc7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsLineItems_019d3faf-aba1-7121-a3b4-a064b5ba72b7" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019d3faf-aba1-7fe6-adee-077dc2bdcc7f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_019d3faf-aba1-766b-89be-816b9d9e76bc" 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_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019d3faf-aba1-7fe6-adee-077dc2bdcc7f" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_019d3faf-aba1-766b-89be-816b9d9e76bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedLiabilities_019d3faf-aba1-72a2-a50c-e182787d871a" xlink:href="soun-20260331.xsd#soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019d3faf-aba1-7fe6-adee-077dc2bdcc7f" xlink:to="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedLiabilities_019d3faf-aba1-72a2-a50c-e182787d871a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOperatingLeaseLiability_019d3faf-aba1-728f-b4a6-98289c175d7f" xlink:href="soun-20260331.xsd#soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019d3faf-aba1-7fe6-adee-077dc2bdcc7f" xlink:to="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOperatingLeaseLiability_019d3faf-aba1-728f-b4a6-98289c175d7f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesFinanceLeaseLiability_019d3faf-aba1-7603-86ff-3256a2d3e671" xlink:href="soun-20260331.xsd#soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesFinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019d3faf-aba1-7fe6-adee-077dc2bdcc7f" xlink:to="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesFinanceLeaseLiability_019d3faf-aba1-7603-86ff-3256a2d3e671" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_019d3faf-aba1-78fc-ad26-46030661bd0a" 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_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019d3faf-aba1-7fe6-adee-077dc2bdcc7f" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_019d3faf-aba1-78fc-ad26-46030661bd0a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesDeferredRevenue_019d3faf-aba1-7003-9b43-b28cf3880a8f" xlink:href="soun-20260331.xsd#soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesDeferredRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019d3faf-aba1-7fe6-adee-077dc2bdcc7f" xlink:to="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesDeferredRevenue_019d3faf-aba1-7003-9b43-b28cf3880a8f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOperatingLeaseLiability_019d3faf-aba1-7d56-8567-4ae974fed188" xlink:href="soun-20260331.xsd#soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019d3faf-aba1-7fe6-adee-077dc2bdcc7f" xlink:to="loc_soun_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOperatingLeaseLiability_019d3faf-aba1-7d56-8567-4ae974fed188" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_019d3faf-aba1-7a60-98b8-11bbe9fa1f19" 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_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019d3faf-aba1-7fe6-adee-077dc2bdcc7f" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_019d3faf-aba1-7a60-98b8-11bbe9fa1f19" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_019d3faf-aba1-7560-a4e2-9fe605ac81c2" 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_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_019d3faf-aba1-7fe6-adee-077dc2bdcc7f" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_019d3faf-aba1-7560-a4e2-9fe605ac81c2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_019d3faf-aba1-7c02-91f1-d934dbda9810" 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_019d3faf-aba1-7121-a3b4-a064b5ba72b7" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_019d3faf-aba1-7c02-91f1-d934dbda9810" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019d3faf-aba1-7567-b3e5-84a178ca4f66" 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_019d3faf-aba1-7121-a3b4-a064b5ba72b7" xlink:to="loc_us-gaap_Goodwill_019d3faf-aba1-7567-b3e5-84a178ca4f66" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/BUSINESSCOMBINATIONSScheduleofFairValuesDetails" xlink:type="simple" xlink:href="soun-20260331.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_019cb0a2-ff87-7e88-8ad6-3703b55fb99d" 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_019cb0a2-ff87-7ddb-b09b-aadf0c3d0e27" 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_019cb0a2-ff87-7e88-8ad6-3703b55fb99d" xlink:to="loc_us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsTable_019cb0a2-ff87-7ddb-b09b-aadf0c3d0e27" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019cb0a2-ff87-76dd-87c3-f59b21fa3e6f" 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_019cb0a2-ff87-7ddb-b09b-aadf0c3d0e27" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019cb0a2-ff87-76dd-87c3-f59b21fa3e6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a2-ff87-76dd-87c3-f59b21fa3e6f_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_019cb0a2-ff87-76dd-87c3-f59b21fa3e6f" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a2-ff87-76dd-87c3-f59b21fa3e6f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a2-ff87-748c-be69-b3f45589b69b" 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_019cb0a2-ff87-76dd-87c3-f59b21fa3e6f" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a2-ff87-748c-be69-b3f45589b69b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_InteractionsCorporationMember_019cb0a2-ff87-7868-b03c-0f6c29ffccec" xlink:href="soun-20260331.xsd#soun_InteractionsCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a2-ff87-748c-be69-b3f45589b69b" xlink:to="loc_soun_InteractionsCorporationMember_019cb0a2-ff87-7868-b03c-0f6c29ffccec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019cb0a2-ff87-7e08-9da2-88cd106af964" 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_019cb0a2-ff87-7ddb-b09b-aadf0c3d0e27" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019cb0a2-ff87-7e08-9da2-88cd106af964" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb0a2-ff87-7e08-9da2-88cd106af964_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_019cb0a2-ff87-7e08-9da2-88cd106af964" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb0a2-ff87-7e08-9da2-88cd106af964_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb0a2-ff87-7441-950f-cc5a6d9666b8" 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_019cb0a2-ff87-7e08-9da2-88cd106af964" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb0a2-ff87-7441-950f-cc5a6d9666b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_019cb0a2-ff87-7255-accc-f7a3f8ce24c0" 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_019cb0a2-ff87-7441-950f-cc5a6d9666b8" xlink:to="loc_us-gaap_CustomerRelatedIntangibleAssetsMember_019cb0a2-ff87-7255-accc-f7a3f8ce24c0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_019cb0a2-ff87-7fe8-9f62-516518c8dd3c" 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_019cb0a2-ff87-7441-950f-cc5a6d9666b8" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_019cb0a2-ff87-7fe8-9f62-516518c8dd3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksMember_019cb0a2-ff87-7f38-8f1e-1c65e1ad251e" 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_019cb0a2-ff87-7441-950f-cc5a6d9666b8" xlink:to="loc_us-gaap_TrademarksMember_019cb0a2-ff87-7f38-8f1e-1c65e1ad251e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019cb0a2-ff87-7cdc-81c3-addd737101a5" 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_019cb0a2-ff87-7e88-8ad6-3703b55fb99d" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019cb0a2-ff87-7cdc-81c3-addd737101a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019cb0a2-ff87-76ad-8b49-27bd9ffc4651" 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_019cb0a2-ff87-7e88-8ad6-3703b55fb99d" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019cb0a2-ff87-76ad-8b49-27bd9ffc4651" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/REVENUERECOGNITIONNarrativesDetails" xlink:type="simple" xlink:href="soun-20260331.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_019cb0a3-0036-78f6-ac2f-e8150d38b9b2" 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_019cb0a3-0036-706f-9707-c5c0a9e79a1e" 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_019cb0a3-0036-78f6-ac2f-e8150d38b9b2" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019cb0a3-0036-706f-9707-c5c0a9e79a1e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb0a3-0036-7738-bc15-792d46121661" 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_019cb0a3-0036-706f-9707-c5c0a9e79a1e" xlink:to="loc_srt_ProductOrServiceAxis_019cb0a3-0036-7738-bc15-792d46121661" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb0a3-0036-7738-bc15-792d46121661_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_019cb0a3-0036-7738-bc15-792d46121661" xlink:to="loc_srt_ProductsAndServicesDomain_019cb0a3-0036-7738-bc15-792d46121661_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb0a3-0036-7742-8451-2a7389645fef" 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_019cb0a3-0036-7738-bc15-792d46121661" xlink:to="loc_srt_ProductsAndServicesDomain_019cb0a3-0036-7742-8451-2a7389645fef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ProfessionalServiceMember_019cb0a3-0036-70f5-a56c-347755fd5aed" xlink:href="soun-20260331.xsd#soun_ProfessionalServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb0a3-0036-7742-8451-2a7389645fef" xlink:to="loc_soun_ProfessionalServiceMember_019cb0a3-0036-70f5-a56c-347755fd5aed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019cb0a3-0036-769e-bc48-fb628cd48171" 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_019cb0a3-0036-706f-9707-c5c0a9e79a1e" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019cb0a3-0036-769e-bc48-fb628cd48171" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019cb0a3-0036-769e-bc48-fb628cd48171_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_019cb0a3-0036-769e-bc48-fb628cd48171" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019cb0a3-0036-769e-bc48-fb628cd48171_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019cb0a3-0036-7caa-b5dd-9e82718aa23b" 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_019cb0a3-0036-769e-bc48-fb628cd48171" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019cb0a3-0036-7caa-b5dd-9e82718aa23b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredOverTimeMember_019cb0a3-0036-7cb0-9cb3-de6afe1fbd0c" 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_019cb0a3-0036-7caa-b5dd-9e82718aa23b" xlink:to="loc_us-gaap_TransferredOverTimeMember_019cb0a3-0036-7cb0-9cb3-de6afe1fbd0c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredAtPointInTimeMember_019cb0a3-0036-7893-8dd7-03a2a23dc4a9" 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_019cb0a3-0036-7caa-b5dd-9e82718aa23b" xlink:to="loc_us-gaap_TransferredAtPointInTimeMember_019cb0a3-0036-7893-8dd7-03a2a23dc4a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019cb0a3-0036-7d6b-8ece-3f3100ff7679" 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_019cb0a3-0036-706f-9707-c5c0a9e79a1e" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019cb0a3-0036-7d6b-8ece-3f3100ff7679" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuePerformanceObligationDescriptionOfTiming_019cb0a3-0036-7daa-b304-864d81014c47" 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_019cb0a3-0036-78f6-ac2f-e8150d38b9b2" xlink:to="loc_us-gaap_RevenuePerformanceObligationDescriptionOfTiming_019cb0a3-0036-7daa-b304-864d81014c47" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019cb0a3-0036-705e-8c51-0ca5f5a5fb2d" 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_019cb0a3-0036-78f6-ac2f-e8150d38b9b2" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019cb0a3-0036-705e-8c51-0ca5f5a5fb2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNet_019cb0a3-0036-7de3-ae46-2e9e86a866dd" 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_019cb0a3-0036-78f6-ac2f-e8150d38b9b2" xlink:to="loc_us-gaap_AccountsReceivableNet_019cb0a3-0036-7de3-ae46-2e9e86a866dd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetCurrent_019cb0a3-0036-753c-b909-2f5d74b44045" 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_019cb0a3-0036-78f6-ac2f-e8150d38b9b2" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetCurrent_019cb0a3-0036-753c-b909-2f5d74b44045" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_019cb0a3-0036-7cc2-99a8-13b2daf3fb4c" 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_019cb0a3-0036-78f6-ac2f-e8150d38b9b2" xlink:to="loc_us-gaap_ContractWithCustomerLiability_019cb0a3-0036-7cc2-99a8-13b2daf3fb4c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019cb0a3-0036-7f34-ad24-19d2763d3857" 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_019cb0a3-0036-78f6-ac2f-e8150d38b9b2" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019cb0a3-0036-7f34-ad24-19d2763d3857" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019cb0a3-0036-70ce-afc0-a64e6f4b692b" 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_019cb0a3-0036-78f6-ac2f-e8150d38b9b2" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019cb0a3-0036-70ce-afc0-a64e6f4b692b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019cb0a3-0036-7594-9ef8-8ff259763295" 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_019cb0a3-0036-78f6-ac2f-e8150d38b9b2" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019cb0a3-0036-7594-9ef8-8ff259763295" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/REVENUERECOGNITIONNarrativesDetails_1" xlink:type="simple" xlink:href="soun-20260331.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_019cb0a3-0036-78f6-ac2f-e8150d38b9b2" 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_019cb0a3-0036-706f-9707-c5c0a9e79a1e" 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_019cb0a3-0036-78f6-ac2f-e8150d38b9b2" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019cb0a3-0036-706f-9707-c5c0a9e79a1e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb0a3-0036-7738-bc15-792d46121661" 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_019cb0a3-0036-706f-9707-c5c0a9e79a1e" xlink:to="loc_srt_ProductOrServiceAxis_019cb0a3-0036-7738-bc15-792d46121661" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb0a3-0036-7738-bc15-792d46121661_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_019cb0a3-0036-7738-bc15-792d46121661" xlink:to="loc_srt_ProductsAndServicesDomain_019cb0a3-0036-7738-bc15-792d46121661_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb0a3-0036-7742-8451-2a7389645fef" 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_019cb0a3-0036-7738-bc15-792d46121661" xlink:to="loc_srt_ProductsAndServicesDomain_019cb0a3-0036-7742-8451-2a7389645fef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ProfessionalServiceMember_019cb0a3-0036-70f5-a56c-347755fd5aed" xlink:href="soun-20260331.xsd#soun_ProfessionalServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb0a3-0036-7742-8451-2a7389645fef" xlink:to="loc_soun_ProfessionalServiceMember_019cb0a3-0036-70f5-a56c-347755fd5aed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019cb0a3-0036-769e-bc48-fb628cd48171" 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_019cb0a3-0036-706f-9707-c5c0a9e79a1e" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019cb0a3-0036-769e-bc48-fb628cd48171" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019cb0a3-0036-769e-bc48-fb628cd48171_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_019cb0a3-0036-769e-bc48-fb628cd48171" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019cb0a3-0036-769e-bc48-fb628cd48171_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019cb0a3-0036-7caa-b5dd-9e82718aa23b" 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_019cb0a3-0036-769e-bc48-fb628cd48171" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019cb0a3-0036-7caa-b5dd-9e82718aa23b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredOverTimeMember_019cb0a3-0036-7cb0-9cb3-de6afe1fbd0c" 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_019cb0a3-0036-7caa-b5dd-9e82718aa23b" xlink:to="loc_us-gaap_TransferredOverTimeMember_019cb0a3-0036-7cb0-9cb3-de6afe1fbd0c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredAtPointInTimeMember_019cb0a3-0036-7893-8dd7-03a2a23dc4a9" 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_019cb0a3-0036-7caa-b5dd-9e82718aa23b" xlink:to="loc_us-gaap_TransferredAtPointInTimeMember_019cb0a3-0036-7893-8dd7-03a2a23dc4a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuePerformanceObligationDescriptionOfTiming_019cb0a3-0036-7daa-b304-864d81014c47" 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_019cb0a3-0036-78f6-ac2f-e8150d38b9b2" xlink:to="loc_us-gaap_RevenuePerformanceObligationDescriptionOfTiming_019cb0a3-0036-7daa-b304-864d81014c47" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019cb0a3-0036-705e-8c51-0ca5f5a5fb2d" 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_019cb0a3-0036-78f6-ac2f-e8150d38b9b2" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019cb0a3-0036-705e-8c51-0ca5f5a5fb2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNet_019cb0a3-0036-7de3-ae46-2e9e86a866dd" 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_019cb0a3-0036-78f6-ac2f-e8150d38b9b2" xlink:to="loc_us-gaap_AccountsReceivableNet_019cb0a3-0036-7de3-ae46-2e9e86a866dd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetCurrent_019cb0a3-0036-753c-b909-2f5d74b44045" 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_019cb0a3-0036-78f6-ac2f-e8150d38b9b2" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetCurrent_019cb0a3-0036-753c-b909-2f5d74b44045" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_019cb0a3-0036-7cc2-99a8-13b2daf3fb4c" 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_019cb0a3-0036-78f6-ac2f-e8150d38b9b2" xlink:to="loc_us-gaap_ContractWithCustomerLiability_019cb0a3-0036-7cc2-99a8-13b2daf3fb4c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019cb0a3-0036-7f34-ad24-19d2763d3857" 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_019cb0a3-0036-78f6-ac2f-e8150d38b9b2" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019cb0a3-0036-7f34-ad24-19d2763d3857" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019cb0a3-0036-70ce-afc0-a64e6f4b692b" 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_019cb0a3-0036-78f6-ac2f-e8150d38b9b2" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019cb0a3-0036-70ce-afc0-a64e6f4b692b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019cb0a3-0036-7594-9ef8-8ff259763295" 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_019cb0a3-0036-78f6-ac2f-e8150d38b9b2" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019cb0a3-0036-7594-9ef8-8ff259763295" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/REVENUERECOGNITIONScheduleofrevenuesundereachperformanceDetails" xlink:type="simple" xlink:href="soun-20260331.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_019cb0a3-0036-75e6-80a5-e8532aaccedb" 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_019cb0a3-0036-7af3-a818-e911f3c00695" 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_019cb0a3-0036-75e6-80a5-e8532aaccedb" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019cb0a3-0036-7af3-a818-e911f3c00695" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb0a3-0036-71c5-8872-22990c18b4dc" 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_019cb0a3-0036-7af3-a818-e911f3c00695" xlink:to="loc_srt_ProductOrServiceAxis_019cb0a3-0036-71c5-8872-22990c18b4dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb0a3-0036-71c5-8872-22990c18b4dc_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_019cb0a3-0036-71c5-8872-22990c18b4dc" xlink:to="loc_srt_ProductsAndServicesDomain_019cb0a3-0036-71c5-8872-22990c18b4dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb0a3-0036-7f4f-86cd-b67fd66d7468" 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_019cb0a3-0036-71c5-8872-22990c18b4dc" xlink:to="loc_srt_ProductsAndServicesDomain_019cb0a3-0036-7f4f-86cd-b67fd66d7468" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_HostedServicesMember_019cb0a3-0036-7958-b1ea-c353c20c9f62" xlink:href="soun-20260331.xsd#soun_HostedServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb0a3-0036-7f4f-86cd-b67fd66d7468" xlink:to="loc_soun_HostedServicesMember_019cb0a3-0036-7958-b1ea-c353c20c9f62" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_LicensingMember_019cb0a3-0036-74e7-892b-9977fa056e9c" xlink:href="soun-20260331.xsd#soun_LicensingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb0a3-0036-7f4f-86cd-b67fd66d7468" xlink:to="loc_soun_LicensingMember_019cb0a3-0036-74e7-892b-9977fa056e9c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ProfessionalServiceMember_019cb0a3-0036-73f8-ae0e-c2bb45906ef3" xlink:href="soun-20260331.xsd#soun_ProfessionalServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb0a3-0036-7f4f-86cd-b67fd66d7468" xlink:to="loc_soun_ProfessionalServiceMember_019cb0a3-0036-73f8-ae0e-c2bb45906ef3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MonetizationMember_019cb0a3-0036-7672-9c83-b73ea6dbb16d" xlink:href="soun-20260331.xsd#soun_MonetizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb0a3-0036-7f4f-86cd-b67fd66d7468" xlink:to="loc_soun_MonetizationMember_019cb0a3-0036-7672-9c83-b73ea6dbb16d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019cb0a3-0036-7848-aae3-02663432e327" 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_019cb0a3-0036-75e6-80a5-e8532aaccedb" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019cb0a3-0036-7848-aae3-02663432e327" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/REVENUERECOGNITIONScheduleofdisaggregatesrevenuebygeographiclocationDetails" xlink:type="simple" xlink:href="soun-20260331.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_019cb0a3-0036-780d-ab51-0a053df6370f" 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_019cb0a3-0036-77a4-a73a-178ab868e460" 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_019cb0a3-0036-780d-ab51-0a053df6370f" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019cb0a3-0036-77a4-a73a-178ab868e460" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019cb0a3-0036-7c49-8d1d-191aa8fc201d" 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_019cb0a3-0036-77a4-a73a-178ab868e460" xlink:to="loc_srt_StatementGeographicalAxis_019cb0a3-0036-7c49-8d1d-191aa8fc201d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019cb0a3-0036-7c49-8d1d-191aa8fc201d_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_019cb0a3-0036-7c49-8d1d-191aa8fc201d" xlink:to="loc_srt_SegmentGeographicalDomain_019cb0a3-0036-7c49-8d1d-191aa8fc201d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019cb0a3-0036-7957-8c42-a67e2114e3a7" 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_019cb0a3-0036-7c49-8d1d-191aa8fc201d" xlink:to="loc_srt_SegmentGeographicalDomain_019cb0a3-0036-7957-8c42-a67e2114e3a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019cb0a3-0036-7f07-b52e-b6dd798bc627" 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_019cb0a3-0036-7957-8c42-a67e2114e3a7" xlink:to="loc_country_US_019cb0a3-0036-7f07-b52e-b6dd798bc627" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_JP_019db374-882d-702e-a04d-a6bc9ff60a56" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_JP"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cb0a3-0036-7957-8c42-a67e2114e3a7" xlink:to="loc_country_JP_019db374-882d-702e-a04d-a6bc9ff60a56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_OtherCountriesMember_019cb0a3-0036-7b85-a9e9-4aa0d496ba00" xlink:href="soun-20260331.xsd#soun_OtherCountriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cb0a3-0036-7957-8c42-a67e2114e3a7" xlink:to="loc_soun_OtherCountriesMember_019cb0a3-0036-7b85-a9e9-4aa0d496ba00" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019cb0a3-0036-7641-82c6-f6325bc1738d" 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_019cb0a3-0036-780d-ab51-0a053df6370f" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019cb0a3-0036-7641-82c6-f6325bc1738d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/REVENUERECOGNITIONScheduleofrevenuerecognitionpatternDetails" xlink:type="simple" xlink:href="soun-20260331.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_019cb0a3-0036-7b73-88b5-3c2fb5793a02" 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_019cb0a3-0036-7135-b69d-191905559fb6" 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_019cb0a3-0036-7b73-88b5-3c2fb5793a02" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019cb0a3-0036-7135-b69d-191905559fb6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019cb0a3-0036-7cef-bd0c-526d3d6cff07" 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_019cb0a3-0036-7135-b69d-191905559fb6" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019cb0a3-0036-7cef-bd0c-526d3d6cff07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019cb0a3-0036-7cef-bd0c-526d3d6cff07_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_019cb0a3-0036-7cef-bd0c-526d3d6cff07" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019cb0a3-0036-7cef-bd0c-526d3d6cff07_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019cb0a3-0036-7edd-8da0-c80326d862f0" 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_019cb0a3-0036-7cef-bd0c-526d3d6cff07" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019cb0a3-0036-7edd-8da0-c80326d862f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredOverTimeMember_019cb0a3-0036-7ad2-bf36-ebcf5064aa10" 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_019cb0a3-0036-7edd-8da0-c80326d862f0" xlink:to="loc_us-gaap_TransferredOverTimeMember_019cb0a3-0036-7ad2-bf36-ebcf5064aa10" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredAtPointInTimeMember_019cb0a3-0036-73ea-b264-1bcece44d043" 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_019cb0a3-0036-7edd-8da0-c80326d862f0" xlink:to="loc_us-gaap_TransferredAtPointInTimeMember_019cb0a3-0036-73ea-b264-1bcece44d043" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019cb0a3-0037-7f47-b2c5-2ae418c7df01" 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_019cb0a3-0036-7b73-88b5-3c2fb5793a02" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019cb0a3-0037-7f47-b2c5-2ae418c7df01" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/REVENUERECOGNITIONScheduleofServiceDetails" xlink:type="simple" xlink:href="soun-20260331.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_019cb0a3-0037-7a69-a79b-5bcb4729b02a" 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_019cb0a3-0037-7d4f-8491-bf0e6caf5a93" 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_019cb0a3-0037-7a69-a79b-5bcb4729b02a" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019cb0a3-0037-7d4f-8491-bf0e6caf5a93" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb0a3-0037-75f0-927a-03e21d7d4e0c" 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_019cb0a3-0037-7d4f-8491-bf0e6caf5a93" xlink:to="loc_srt_ProductOrServiceAxis_019cb0a3-0037-75f0-927a-03e21d7d4e0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb0a3-0037-75f0-927a-03e21d7d4e0c_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_019cb0a3-0037-75f0-927a-03e21d7d4e0c" xlink:to="loc_srt_ProductsAndServicesDomain_019cb0a3-0037-75f0-927a-03e21d7d4e0c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb0a3-0037-7805-8031-c91b38949215" 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_019cb0a3-0037-75f0-927a-03e21d7d4e0c" xlink:to="loc_srt_ProductsAndServicesDomain_019cb0a3-0037-7805-8031-c91b38949215" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ServiceSubscriptionsMember_019cb0a3-0037-7a3a-851c-4849768c6223" xlink:href="soun-20260331.xsd#soun_ServiceSubscriptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb0a3-0037-7805-8031-c91b38949215" xlink:to="loc_soun_ServiceSubscriptionsMember_019cb0a3-0037-7a3a-851c-4849768c6223" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ProductRoyaltiesMember_019cb0a3-0037-734d-86bc-5ff5c81d281c" xlink:href="soun-20260331.xsd#soun_ProductRoyaltiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb0a3-0037-7805-8031-c91b38949215" xlink:to="loc_soun_ProductRoyaltiesMember_019cb0a3-0037-734d-86bc-5ff5c81d281c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MonetizationMember_019cb0a3-0037-749e-b78e-811c8b1a3131" xlink:href="soun-20260331.xsd#soun_MonetizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb0a3-0037-7805-8031-c91b38949215" xlink:to="loc_soun_MonetizationMember_019cb0a3-0037-749e-b78e-811c8b1a3131" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019cb0a3-0037-7ac4-adf1-25a10647ff7c" 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_019cb0a3-0037-7a69-a79b-5bcb4729b02a" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_019cb0a3-0037-7ac4-adf1-25a10647ff7c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/GOODWILLANDINTANGIBLEASSETSScheduleofIntangibleAssetsDetails" xlink:type="simple" xlink:href="soun-20260331.xsd#GOODWILLANDINTANGIBLEASSETSScheduleofIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/GOODWILLANDINTANGIBLEASSETSScheduleofIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_019cb0a3-0037-7d88-b811-89628e1c6812" 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_019cb0a3-0037-7a84-b2fd-1fc8c833ce02" 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_019cb0a3-0037-7d88-b811-89628e1c6812" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_019cb0a3-0037-7a84-b2fd-1fc8c833ce02" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019cb0a3-0037-7a8e-aa91-52962b7cb4a0" 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_019cb0a3-0037-7a84-b2fd-1fc8c833ce02" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019cb0a3-0037-7a8e-aa91-52962b7cb4a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb0a3-0037-7a8e-aa91-52962b7cb4a0_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_019cb0a3-0037-7a8e-aa91-52962b7cb4a0" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb0a3-0037-7a8e-aa91-52962b7cb4a0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb0a3-0037-7e9b-91ab-9bf9e56bd3df" 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_019cb0a3-0037-7a8e-aa91-52962b7cb4a0" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb0a3-0037-7e9b-91ab-9bf9e56bd3df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_019cb0a3-0037-7c77-be26-009b7b5e82bb" 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_019cb0a3-0037-7e9b-91ab-9bf9e56bd3df" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_019cb0a3-0037-7c77-be26-009b7b5e82bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019cb0a3-0037-79a6-81f8-8234dedd8a05" 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_019cb0a3-0037-7e9b-91ab-9bf9e56bd3df" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019cb0a3-0037-79a6-81f8-8234dedd8a05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_019cb0a3-0037-720f-90a8-931b29523e48" 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_019cb0a3-0037-7e9b-91ab-9bf9e56bd3df" xlink:to="loc_us-gaap_TradeNamesMember_019cb0a3-0037-720f-90a8-931b29523e48" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ConversationDataMember_019cb0a3-0037-7f08-98bd-ab16bf1466ad" xlink:href="soun-20260331.xsd#soun_ConversationDataMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb0a3-0037-7e9b-91ab-9bf9e56bd3df" xlink:to="loc_soun_ConversationDataMember_019cb0a3-0037-7f08-98bd-ab16bf1466ad" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019cb0a3-0037-7677-8c89-4b2d1a4ac96c" 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_019cb0a3-0037-7a84-b2fd-1fc8c833ce02" xlink:to="loc_srt_RangeAxis_019cb0a3-0037-7677-8c89-4b2d1a4ac96c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cb0a3-0037-7677-8c89-4b2d1a4ac96c_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_019cb0a3-0037-7677-8c89-4b2d1a4ac96c" xlink:to="loc_srt_RangeMember_019cb0a3-0037-7677-8c89-4b2d1a4ac96c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cb0a3-0037-7926-a2b9-5da72350cb5e" 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_019cb0a3-0037-7677-8c89-4b2d1a4ac96c" xlink:to="loc_srt_RangeMember_019cb0a3-0037-7926-a2b9-5da72350cb5e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019cb0a3-0037-7418-bc61-1c08fd1b92e1" 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_019cb0a3-0037-7926-a2b9-5da72350cb5e" xlink:to="loc_srt_MinimumMember_019cb0a3-0037-7418-bc61-1c08fd1b92e1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019cb0a3-0037-7f7b-94e4-f1e1c28c026c" 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_019cb0a3-0037-7926-a2b9-5da72350cb5e" xlink:to="loc_srt_MaximumMember_019cb0a3-0037-7f7b-94e4-f1e1c28c026c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_019cb0a3-0037-703c-93a4-867d01f3eef4" 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_019cb0a3-0037-7d88-b811-89628e1c6812" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_019cb0a3-0037-703c-93a4-867d01f3eef4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019cb0a3-0037-7a55-b6cf-16f087c51ab7" 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_019cb0a3-0037-7d88-b811-89628e1c6812" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019cb0a3-0037-7a55-b6cf-16f087c51ab7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019cb0a3-0037-7db3-8b20-afc2805336e8" 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_019cb0a3-0037-7d88-b811-89628e1c6812" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019cb0a3-0037-7db3-8b20-afc2805336e8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019cb0a3-0037-767a-b2e6-7a2e4acb1b3f" 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_019cb0a3-0037-7d88-b811-89628e1c6812" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019cb0a3-0037-767a-b2e6-7a2e4acb1b3f" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/COMMITMENTSANDCONTINGENCIESNarrativesDetails" xlink:type="simple" xlink:href="soun-20260331.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_019cb0a3-0037-705c-b065-f95a643ce78a" 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_019cb0a3-0037-7b3e-b45a-b08d882f3c5c" 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_019cb0a3-0037-705c-b065-f95a643ce78a" xlink:to="loc_us-gaap_LossContingenciesTable_019cb0a3-0037-7b3e-b45a-b08d882f3c5c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019cb0a3-0037-7c66-aafb-625eb0ee5449" 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_019cb0a3-0037-7b3e-b45a-b08d882f3c5c" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019cb0a3-0037-7c66-aafb-625eb0ee5449" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_019cb0a3-0037-7c66-aafb-625eb0ee5449_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_019cb0a3-0037-7c66-aafb-625eb0ee5449" xlink:to="loc_us-gaap_LossContingencyNatureDomain_019cb0a3-0037-7c66-aafb-625eb0ee5449_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_019cb0a3-0037-7176-b77c-514d7fc45616" 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_019cb0a3-0037-7c66-aafb-625eb0ee5449" xlink:to="loc_us-gaap_LossContingencyNatureDomain_019cb0a3-0037-7176-b77c-514d7fc45616" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_PossibleSalesTaxLiabilityMember_019cb0a3-0037-7e33-9911-d5eb031b9126" xlink:href="soun-20260331.xsd#soun_PossibleSalesTaxLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_019cb0a3-0037-7176-b77c-514d7fc45616" xlink:to="loc_soun_PossibleSalesTaxLiabilityMember_019cb0a3-0037-7e33-9911-d5eb031b9126" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyAccrualAtCarryingValue_019cb0a3-0037-7dc2-917f-ee791e0074a2" 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_019cb0a3-0037-705c-b065-f95a643ce78a" xlink:to="loc_us-gaap_LossContingencyAccrualAtCarryingValue_019cb0a3-0037-7dc2-917f-ee791e0074a2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermPurchaseCommitmentPeriod_019cb0a3-0037-7eed-bc2c-81991b963bec" 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_019cb0a3-0037-705c-b065-f95a643ce78a" xlink:to="loc_us-gaap_LongtermPurchaseCommitmentPeriod_019cb0a3-0037-7eed-bc2c-81991b963bec" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/WARRANTSDetails" xlink:type="simple" xlink:href="soun-20260331.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_019cb0a3-0037-75bc-92b3-94cfd43e3f86" 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_019cb0a3-0037-724d-90d5-1e14d0c9ba49" 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_019cb0a3-0037-75bc-92b3-94cfd43e3f86" xlink:to="loc_us-gaap_ClassOfWarrantOrRightTable_019cb0a3-0037-724d-90d5-1e14d0c9ba49" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_019cb0a3-0037-766b-bfc2-0e0db8ed9046" 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_019cb0a3-0037-724d-90d5-1e14d0c9ba49" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_019cb0a3-0037-766b-bfc2-0e0db8ed9046" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_019cb0a3-0037-766b-bfc2-0e0db8ed9046_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_019cb0a3-0037-766b-bfc2-0e0db8ed9046" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_019cb0a3-0037-766b-bfc2-0e0db8ed9046_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_019cb0a3-0037-7b37-bd92-978af89a4545" 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_019cb0a3-0037-766b-bfc2-0e0db8ed9046" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_019cb0a3-0037-7b37-bd92-978af89a4545" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_PublicWarrantsMember_019cb0a3-0037-79f0-9ccf-2273ee6469c7" xlink:href="soun-20260331.xsd#soun_PublicWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_019cb0a3-0037-7b37-bd92-978af89a4545" xlink:to="loc_soun_PublicWarrantsMember_019cb0a3-0037-79f0-9ccf-2273ee6469c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_PrivateWarrantsMember_019cb0a3-0037-71e7-9c6a-14543eb26632" xlink:href="soun-20260331.xsd#soun_PrivateWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_019cb0a3-0037-7b37-bd92-978af89a4545" xlink:to="loc_soun_PrivateWarrantsMember_019cb0a3-0037-71e7-9c6a-14543eb26632" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019cb0a3-0037-7554-a210-50aaf5fa63b4" 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_019cb0a3-0037-724d-90d5-1e14d0c9ba49" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019cb0a3-0037-7554-a210-50aaf5fa63b4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb0a3-0037-7554-a210-50aaf5fa63b4_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_019cb0a3-0037-7554-a210-50aaf5fa63b4" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb0a3-0037-7554-a210-50aaf5fa63b4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb0a3-0037-75b3-9412-60e732a91d34" 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_019cb0a3-0037-7554-a210-50aaf5fa63b4" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb0a3-0037-75b3-9412-60e732a91d34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019cb0a3-0037-7eb7-820f-3319e9e9dc5e" 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_019cb0a3-0037-75b3-9412-60e732a91d34" xlink:to="loc_us-gaap_CommonClassAMember_019cb0a3-0037-7eb7-820f-3319e9e9dc5e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019cb0a3-0037-7bcc-83ed-bd90ba7cab69" 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_019cb0a3-0037-724d-90d5-1e14d0c9ba49" xlink:to="loc_dei_LegalEntityAxis_019cb0a3-0037-7bcc-83ed-bd90ba7cab69" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019cb0a3-0037-7bcc-83ed-bd90ba7cab69_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_019cb0a3-0037-7bcc-83ed-bd90ba7cab69" xlink:to="loc_dei_EntityDomain_019cb0a3-0037-7bcc-83ed-bd90ba7cab69_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019cb0a3-0037-7875-a4d8-e13b899d0f25" 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_019cb0a3-0037-7bcc-83ed-bd90ba7cab69" xlink:to="loc_dei_EntityDomain_019cb0a3-0037-7875-a4d8-e13b899d0f25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ArchimedesTechSPACPartnersCoATSPMember_019cb0a3-0037-78c6-861d-c79a081968ef" xlink:href="soun-20260331.xsd#soun_ArchimedesTechSPACPartnersCoATSPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019cb0a3-0037-7875-a4d8-e13b899d0f25" xlink:to="loc_soun_ArchimedesTechSPACPartnersCoATSPMember_019cb0a3-0037-78c6-861d-c79a081968ef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_TriggeringEventsAxis_019cb0a3-0037-7b3f-9ed9-ca89adee9918" xlink:href="soun-20260331.xsd#soun_TriggeringEventsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfWarrantOrRightTable_019cb0a3-0037-724d-90d5-1e14d0c9ba49" xlink:to="loc_soun_TriggeringEventsAxis_019cb0a3-0037-7b3f-9ed9-ca89adee9918" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_TriggeringEventsDomain_019cb0a3-0037-7b3f-9ed9-ca89adee9918_default" xlink:href="soun-20260331.xsd#soun_TriggeringEventsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_soun_TriggeringEventsAxis_019cb0a3-0037-7b3f-9ed9-ca89adee9918" xlink:to="loc_soun_TriggeringEventsDomain_019cb0a3-0037-7b3f-9ed9-ca89adee9918_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_TriggeringEventsDomain_019cb0a3-0037-7806-8499-a73296902707" xlink:href="soun-20260331.xsd#soun_TriggeringEventsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_soun_TriggeringEventsAxis_019cb0a3-0037-7b3f-9ed9-ca89adee9918" xlink:to="loc_soun_TriggeringEventsDomain_019cb0a3-0037-7806-8499-a73296902707" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SharePriceEqualOrExceedsEighteenDollarsMember_019cb0a3-0037-752c-9012-8ac354c269c5" xlink:href="soun-20260331.xsd#soun_SharePriceEqualOrExceedsEighteenDollarsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_soun_TriggeringEventsDomain_019cb0a3-0037-7806-8499-a73296902707" xlink:to="loc_soun_SharePriceEqualOrExceedsEighteenDollarsMember_019cb0a3-0037-752c-9012-8ac354c269c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019cb0a3-0037-766b-a8fa-c0e3655cae78" 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_019cb0a3-0037-724d-90d5-1e14d0c9ba49" xlink:to="loc_srt_RangeAxis_019cb0a3-0037-766b-a8fa-c0e3655cae78" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cb0a3-0037-766b-a8fa-c0e3655cae78_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_019cb0a3-0037-766b-a8fa-c0e3655cae78" xlink:to="loc_srt_RangeMember_019cb0a3-0037-766b-a8fa-c0e3655cae78_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cb0a3-0037-7cca-95b2-1bd795e3a872" 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_019cb0a3-0037-766b-a8fa-c0e3655cae78" xlink:to="loc_srt_RangeMember_019cb0a3-0037-7cca-95b2-1bd795e3a872" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019cb0a3-0037-77b7-937d-e75cb8da6149" 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_019cb0a3-0037-7cca-95b2-1bd795e3a872" xlink:to="loc_srt_MinimumMember_019cb0a3-0037-77b7-937d-e75cb8da6149" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019cb0a3-0037-7c96-b560-07600eb3207e" 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_019cb0a3-0037-7cca-95b2-1bd795e3a872" xlink:to="loc_srt_MaximumMember_019cb0a3-0037-7c96-b560-07600eb3207e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_019cb0a3-0037-7c81-8c49-22a00e270a20" 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_019cb0a3-0037-75bc-92b3-94cfd43e3f86" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_019cb0a3-0037-7c81-8c49-22a00e270a20" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ClassOfWarrantsRedemptionPricePerUnit_019cb0a3-0037-7fcd-a3ed-f87b49677ce2" xlink:href="soun-20260331.xsd#soun_ClassOfWarrantsRedemptionPricePerUnit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019cb0a3-0037-75bc-92b3-94cfd43e3f86" xlink:to="loc_soun_ClassOfWarrantsRedemptionPricePerUnit_019cb0a3-0037-7fcd-a3ed-f87b49677ce2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ClassOfWarrantsRedemptionNoticePeriod_019cb0a3-0037-7a51-a1ee-a0d3ad2edf7d" xlink:href="soun-20260331.xsd#soun_ClassOfWarrantsRedemptionNoticePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019cb0a3-0037-75bc-92b3-94cfd43e3f86" xlink:to="loc_soun_ClassOfWarrantsRedemptionNoticePeriod_019cb0a3-0037-7a51-a1ee-a0d3ad2edf7d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ClassOfWarrantOrRightTriggerPrice_019cb0a3-0037-7ec2-842c-de138e30d9c2" xlink:href="soun-20260331.xsd#soun_ClassOfWarrantOrRightTriggerPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019cb0a3-0037-75bc-92b3-94cfd43e3f86" xlink:to="loc_soun_ClassOfWarrantOrRightTriggerPrice_019cb0a3-0037-7ec2-842c-de138e30d9c2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_NumberOfConsecutiveTradingDaysForDeterminingSharePrice_019cb0a3-0037-75c7-b57e-8a2b40fbd524" xlink:href="soun-20260331.xsd#soun_NumberOfConsecutiveTradingDaysForDeterminingSharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019cb0a3-0037-75bc-92b3-94cfd43e3f86" xlink:to="loc_soun_NumberOfConsecutiveTradingDaysForDeterminingSharePrice_019cb0a3-0037-75c7-b57e-8a2b40fbd524" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightOutstanding_019cb0a3-0037-7ca0-8ea3-9f30293202a5" 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_019cb0a3-0037-75bc-92b3-94cfd43e3f86" xlink:to="loc_us-gaap_ClassOfWarrantOrRightOutstanding_019cb0a3-0037-7ca0-8ea3-9f30293202a5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockSharesIssued1_019d3f26-367d-7315-aa14-570c2e3bd3b9" 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_019cb0a3-0037-75bc-92b3-94cfd43e3f86" xlink:to="loc_us-gaap_ConversionOfStockSharesIssued1_019d3f26-367d-7315-aa14-570c2e3bd3b9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromWarrantExercises_019d3f25-a9a0-717f-87e0-c1b7fce5522f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromWarrantExercises"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightLineItems_019cb0a3-0037-75bc-92b3-94cfd43e3f86" xlink:to="loc_us-gaap_ProceedsFromWarrantExercises_019d3f25-a9a0-717f-87e0-c1b7fce5522f" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/PREFERREDSTOCKDetails" xlink:type="simple" xlink:href="soun-20260331.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_019cb0a3-0037-7df3-8bd2-b4a7e91b0b83" 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_019cb0a3-0037-7f27-9e54-c647fe444732" 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_019cb0a3-0037-7df3-8bd2-b4a7e91b0b83" xlink:to="loc_us-gaap_ScheduleOfPreferredUnitsTable_019cb0a3-0037-7f27-9e54-c647fe444732" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019cb0a3-0037-7fb3-92ab-ede9e774b261" 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_019cb0a3-0037-7f27-9e54-c647fe444732" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019cb0a3-0037-7fb3-92ab-ede9e774b261" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb0a3-0037-7fb3-92ab-ede9e774b261_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_019cb0a3-0037-7fb3-92ab-ede9e774b261" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb0a3-0037-7fb3-92ab-ede9e774b261_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb0a3-0037-7557-8678-c7f45bb1ec9c" 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_019cb0a3-0037-7fb3-92ab-ede9e774b261" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb0a3-0037-7557-8678-c7f45bb1ec9c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesAPreferredStockMember_019cb0a3-0037-7d4a-a1c7-72fd78c32d91" 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_019cb0a3-0037-7557-8678-c7f45bb1ec9c" xlink:to="loc_us-gaap_SeriesAPreferredStockMember_019cb0a3-0037-7d4a-a1c7-72fd78c32d91" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_019cb0a3-0037-75ed-aa4e-fc4627a3a9ae" 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_019cb0a3-0037-7557-8678-c7f45bb1ec9c" xlink:to="loc_us-gaap_PreferredStockMember_019cb0a3-0037-75ed-aa4e-fc4627a3a9ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019cb0a3-0037-7b8d-b0c9-13e98c12321b" 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_019cb0a3-0037-7df3-8bd2-b4a7e91b0b83" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019cb0a3-0037-7b8d-b0c9-13e98c12321b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_019cb0a3-0037-7b00-b713-239d3fb8ca75" 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_019cb0a3-0037-7df3-8bd2-b4a7e91b0b83" xlink:to="loc_us-gaap_SaleOfStockPricePerShare_019cb0a3-0037-7b00-b713-239d3fb8ca75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockLiquidationPreference_019cb0a3-0037-7f2a-b7a8-e58bb4acd126" 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_019cb0a3-0037-7df3-8bd2-b4a7e91b0b83" xlink:to="loc_us-gaap_PreferredStockLiquidationPreference_019cb0a3-0037-7f2a-b7a8-e58bb4acd126" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_019cb0a3-0037-7cf9-bda5-91fee4a1ca40" 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_019cb0a3-0037-7df3-8bd2-b4a7e91b0b83" xlink:to="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_019cb0a3-0037-7cf9-bda5-91fee4a1ca40" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockConvertibleConversionPrice_019cb0a3-0037-7607-bf12-63222ecaf4ed" 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_019cb0a3-0037-7df3-8bd2-b4a7e91b0b83" xlink:to="loc_us-gaap_PreferredStockConvertibleConversionPrice_019cb0a3-0037-7607-bf12-63222ecaf4ed" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_CommonStockConvertibleConversionPriceRatio_019cb0a3-0037-75bb-bf40-30f48fba3b6b" xlink:href="soun-20260331.xsd#soun_CommonStockConvertibleConversionPriceRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PreferredUnitsLineItems_019cb0a3-0037-7df3-8bd2-b4a7e91b0b83" xlink:to="loc_soun_CommonStockConvertibleConversionPriceRatio_019cb0a3-0037-75bb-bf40-30f48fba3b6b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_PreferredStockConvertibleThresholdTradingDays_019cb0a3-0037-79e0-9318-ad46d604435a" xlink:href="soun-20260331.xsd#soun_PreferredStockConvertibleThresholdTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PreferredUnitsLineItems_019cb0a3-0037-7df3-8bd2-b4a7e91b0b83" xlink:to="loc_soun_PreferredStockConvertibleThresholdTradingDays_019cb0a3-0037-79e0-9318-ad46d604435a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_PreferredStockConvertibleThresholdConsecutiveTradingDays_019cb0a3-0037-7199-b549-5a590e9b667c" xlink:href="soun-20260331.xsd#soun_PreferredStockConvertibleThresholdConsecutiveTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PreferredUnitsLineItems_019cb0a3-0037-7df3-8bd2-b4a7e91b0b83" xlink:to="loc_soun_PreferredStockConvertibleThresholdConsecutiveTradingDays_019cb0a3-0037-7199-b549-5a590e9b667c" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/COMMONSTOCKDetails" xlink:type="simple" xlink:href="soun-20260331.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_019cb0a3-0037-7d77-bd92-383d804b9249" 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_019cb0a3-0037-7dee-b6f5-43491c50c7dc" 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_019cb0a3-0037-7d77-bd92-383d804b9249" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_019cb0a3-0037-7dee-b6f5-43491c50c7dc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019cb0a3-0037-7f1c-9796-c38a1f7d8b85" 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_019cb0a3-0037-7dee-b6f5-43491c50c7dc" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019cb0a3-0037-7f1c-9796-c38a1f7d8b85" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb0a3-0037-7f1c-9796-c38a1f7d8b85_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_019cb0a3-0037-7f1c-9796-c38a1f7d8b85" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb0a3-0037-7f1c-9796-c38a1f7d8b85_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb0a3-0037-717d-aa95-0064dd968153" 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_019cb0a3-0037-7f1c-9796-c38a1f7d8b85" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb0a3-0037-717d-aa95-0064dd968153" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019cb0a3-0037-7a1c-9aeb-686b80de5c03" 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_019cb0a3-0037-717d-aa95-0064dd968153" xlink:to="loc_us-gaap_CommonClassAMember_019cb0a3-0037-7a1c-9aeb-686b80de5c03" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019cb0a3-0037-7d63-9778-a9fb296b62d2" 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_019cb0a3-0037-717d-aa95-0064dd968153" xlink:to="loc_us-gaap_CommonClassBMember_019cb0a3-0037-7d63-9778-a9fb296b62d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019cb0a3-0037-7379-9cdf-f9416e31f160" 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_019cb0a3-0037-7dee-b6f5-43491c50c7dc" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019cb0a3-0037-7379-9cdf-f9416e31f160" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019cb0a3-0037-7379-9cdf-f9416e31f160_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_019cb0a3-0037-7379-9cdf-f9416e31f160" xlink:to="loc_us-gaap_EquityComponentDomain_019cb0a3-0037-7379-9cdf-f9416e31f160_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019cb0a3-0037-7d35-a5da-e518f0a19f7f" 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_019cb0a3-0037-7379-9cdf-f9416e31f160" xlink:to="loc_us-gaap_EquityComponentDomain_019cb0a3-0037-7d35-a5da-e518f0a19f7f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019cb0a3-0037-7082-b6e3-8dcd4b920352" 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_019cb0a3-0037-7d35-a5da-e518f0a19f7f" xlink:to="loc_us-gaap_CommonStockMember_019cb0a3-0037-7082-b6e3-8dcd4b920352" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_019cb0a3-0037-758a-855a-8c91273aedbe" 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_019cb0a3-0037-7dee-b6f5-43491c50c7dc" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_019cb0a3-0037-758a-855a-8c91273aedbe" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019cb0a3-0037-758a-855a-8c91273aedbe_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_019cb0a3-0037-758a-855a-8c91273aedbe" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019cb0a3-0037-758a-855a-8c91273aedbe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019cb0a3-0037-79ba-868c-920894b3a85a" 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_019cb0a3-0037-758a-855a-8c91273aedbe" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019cb0a3-0037-79ba-868c-920894b3a85a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SecondEquityDistributionAgreementMember_019cb0a3-0037-7098-9fce-3e38a1afeafa" xlink:href="soun-20260331.xsd#soun_SecondEquityDistributionAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019cb0a3-0037-79ba-868c-920894b3a85a" xlink:to="loc_soun_SecondEquityDistributionAgreementMember_019cb0a3-0037-7098-9fce-3e38a1afeafa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_019cb0a3-0037-72a7-ad29-ca42b6b7208b" 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_019cb0a3-0037-7d77-bd92-383d804b9249" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_019cb0a3-0037-72a7-ad29-ca42b6b7208b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_CommonStockAndPreferredStockSharesAuthorized_019cb0a3-0037-7224-9e6d-7d7be4aa3ae2" xlink:href="soun-20260331.xsd#soun_CommonStockAndPreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019cb0a3-0037-7d77-bd92-383d804b9249" xlink:to="loc_soun_CommonStockAndPreferredStockSharesAuthorized_019cb0a3-0037-7224-9e6d-7d7be4aa3ae2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_019cb0a3-0037-7397-8980-1176f8b88200" 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_019cb0a3-0037-7d77-bd92-383d804b9249" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_019cb0a3-0037-7397-8980-1176f8b88200" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_019cb0a3-0037-7585-8f4a-e974946b7bd4" 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_019cb0a3-0037-7d77-bd92-383d804b9249" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_019cb0a3-0037-7585-8f4a-e974946b7bd4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_019cb0a3-0037-7206-b6d3-01b8ed71a754" 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_019cb0a3-0037-7d77-bd92-383d804b9249" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_019cb0a3-0037-7206-b6d3-01b8ed71a754" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_NumberOfVotesAllocatedToEachShare_019cb0a3-0037-7d2e-95fa-fdf90d25ce04" xlink:href="soun-20260331.xsd#soun_NumberOfVotesAllocatedToEachShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019cb0a3-0037-7d77-bd92-383d804b9249" xlink:to="loc_soun_NumberOfVotesAllocatedToEachShare_019cb0a3-0037-7d2e-95fa-fdf90d25ce04" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_CommonStockConvertibleConversionRatio_019cb0a3-0037-7332-99bd-b55f11f249e5" xlink:href="soun-20260331.xsd#soun_CommonStockConvertibleConversionRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019cb0a3-0037-7d77-bd92-383d804b9249" xlink:to="loc_soun_CommonStockConvertibleConversionRatio_019cb0a3-0037-7332-99bd-b55f11f249e5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockSharesConverted1_019cb0a3-0037-7515-87fc-7fd11ec5c131" 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_019cb0a3-0037-7d77-bd92-383d804b9249" xlink:to="loc_us-gaap_ConversionOfStockSharesConverted1_019cb0a3-0037-7515-87fc-7fd11ec5c131" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SaleOfStockSharesOfStockAuthorizedToBeOfferedAndSold_019cb0a3-0037-77e3-bf75-48bb047e822f" xlink:href="soun-20260331.xsd#soun_SaleOfStockSharesOfStockAuthorizedToBeOfferedAndSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019cb0a3-0037-7d77-bd92-383d804b9249" xlink:to="loc_soun_SaleOfStockSharesOfStockAuthorizedToBeOfferedAndSold_019cb0a3-0037-77e3-bf75-48bb047e822f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SaleOfStockFixedCommissionRate_019cb0a3-0037-7a54-8923-8f37206aeff3" xlink:href="soun-20260331.xsd#soun_SaleOfStockFixedCommissionRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_019cb0a3-0037-7d77-bd92-383d804b9249" xlink:to="loc_soun_SaleOfStockFixedCommissionRate_019cb0a3-0037-7a54-8923-8f37206aeff3" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019cb0a3-0037-7666-a593-d4d11bd9ba13" 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_019cb0a3-0037-7d77-bd92-383d804b9249" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019cb0a3-0037-7666-a593-d4d11bd9ba13" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_019d87be-9e42-7213-8f79-62d95d24661f" 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_019cb0a3-0037-7d77-bd92-383d804b9249" xlink:to="loc_us-gaap_SaleOfStockPricePerShare_019d87be-9e42-7213-8f79-62d95d24661f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019cb0a3-0037-75bf-b65a-e2739acfd495" 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_019cb0a3-0037-7d77-bd92-383d804b9249" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019cb0a3-0037-75bf-b65a-e2739acfd495" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfStockIssuanceCosts_019cb0a3-0037-7dd5-86e2-856c3f3193be" 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_019cb0a3-0037-7d77-bd92-383d804b9249" xlink:to="loc_us-gaap_PaymentsOfStockIssuanceCosts_019cb0a3-0037-7dd5-86e2-856c3f3193be" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/STOCKINCENTIVEPLANSNarrativesDetails" xlink:type="simple" xlink:href="soun-20260331.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_019d3f8c-d025-762e-ac72-c79107214edd" 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_019d3f8c-d025-7deb-b812-c23eaf8ba27f" 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_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019d3f8c-d025-7deb-b812-c23eaf8ba27f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_019d42b7-abc4-77f5-ab65-59aadabf47ec" 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_019d3f8c-d025-7deb-b812-c23eaf8ba27f" xlink:to="loc_us-gaap_PlanNameAxis_019d42b7-abc4-77f5-ab65-59aadabf47ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019d42b7-abc4-77f5-ab65-59aadabf47ec_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_019d42b7-abc4-77f5-ab65-59aadabf47ec" xlink:to="loc_us-gaap_PlanNameDomain_019d42b7-abc4-77f5-ab65-59aadabf47ec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019d42b7-abc4-7840-9904-b2f87b25f178" 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_019d42b7-abc4-77f5-ab65-59aadabf47ec" xlink:to="loc_us-gaap_PlanNameDomain_019d42b7-abc4-7840-9904-b2f87b25f178" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_TwoThousandSixteenEquityIncentivePlanMember_019d42b7-abc4-7dfe-8e1c-9d49c88556eb" xlink:href="soun-20260331.xsd#soun_TwoThousandSixteenEquityIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_019d42b7-abc4-7840-9904-b2f87b25f178" xlink:to="loc_soun_TwoThousandSixteenEquityIncentivePlanMember_019d42b7-abc4-7dfe-8e1c-9d49c88556eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_TwoThousandTwentyTwoIncentivePlanMember_019d42b7-abc4-774d-af3e-b8eebd65f4e2" xlink:href="soun-20260331.xsd#soun_TwoThousandTwentyTwoIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_019d42b7-abc4-7840-9904-b2f87b25f178" xlink:to="loc_soun_TwoThousandTwentyTwoIncentivePlanMember_019d42b7-abc4-774d-af3e-b8eebd65f4e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_TwoThousandTwentyTwoEmployeeStockPurchasePlanMember_019d42b7-abc4-774b-8b92-382edf6205e9" xlink:href="soun-20260331.xsd#soun_TwoThousandTwentyTwoEmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_019d42b7-abc4-7840-9904-b2f87b25f178" xlink:to="loc_soun_TwoThousandTwentyTwoEmployeeStockPurchasePlanMember_019d42b7-abc4-774b-8b92-382edf6205e9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_A2024EmploymentInducementIncentiveAwardPlanMember_019d42b7-abc4-72f3-b75c-0f9c69701480" xlink:href="soun-20260331.xsd#soun_A2024EmploymentInducementIncentiveAwardPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_019d42b7-abc4-7840-9904-b2f87b25f178" xlink:to="loc_soun_A2024EmploymentInducementIncentiveAwardPlanMember_019d42b7-abc4-72f3-b75c-0f9c69701480" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019d42b7-abc4-781c-83eb-093270d27bd4" 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_019d3f8c-d025-7deb-b812-c23eaf8ba27f" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019d42b7-abc4-781c-83eb-093270d27bd4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019d42b7-abc4-781c-83eb-093270d27bd4_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_019d42b7-abc4-781c-83eb-093270d27bd4" xlink:to="loc_us-gaap_ClassOfStockDomain_019d42b7-abc4-781c-83eb-093270d27bd4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019d42b7-abc4-77d3-ba25-e0a9aa771ea4" 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_019d42b7-abc4-781c-83eb-093270d27bd4" xlink:to="loc_us-gaap_ClassOfStockDomain_019d42b7-abc4-77d3-ba25-e0a9aa771ea4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019d42b7-abc4-7d0d-a6ea-6da849772d69" 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_019d42b7-abc4-77d3-ba25-e0a9aa771ea4" xlink:to="loc_us-gaap_CommonClassAMember_019d42b7-abc4-7d0d-a6ea-6da849772d69" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019d42b8-102d-72df-aa7e-01e45c26ec50" 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_019d3f8c-d025-7deb-b812-c23eaf8ba27f" xlink:to="loc_us-gaap_AwardTypeAxis_019d42b8-102d-72df-aa7e-01e45c26ec50" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d42b8-102d-72df-aa7e-01e45c26ec50_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_019d42b8-102d-72df-aa7e-01e45c26ec50" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d42b8-102d-72df-aa7e-01e45c26ec50_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d42b8-102d-77ed-857c-cb14c8194c06" 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_019d42b8-102d-72df-aa7e-01e45c26ec50" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d42b8-102d-77ed-857c-cb14c8194c06" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_019d42b8-102d-7748-97a4-8cbf6cf099f5" 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_019d42b8-102d-77ed-857c-cb14c8194c06" xlink:to="loc_us-gaap_EmployeeStockOptionMember_019d42b8-102d-7748-97a4-8cbf6cf099f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019d42b8-102d-787c-b1f6-44295cf3ca7d" 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_019d42b8-102d-77ed-857c-cb14c8194c06" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019d42b8-102d-787c-b1f6-44295cf3ca7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MarketBasedRestrictedStockUnitsMember_019d42b8-102d-7777-8536-d62a1aec3b20" xlink:href="soun-20260331.xsd#soun_MarketBasedRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d42b8-102d-77ed-857c-cb14c8194c06" xlink:to="loc_soun_MarketBasedRestrictedStockUnitsMember_019d42b8-102d-7777-8536-d62a1aec3b20" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_019d42b9-20e4-7607-be79-f5ba5a693d46" 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_019d42b8-102d-77ed-857c-cb14c8194c06" xlink:to="loc_us-gaap_PerformanceSharesMember_019d42b9-20e4-7607-be79-f5ba5a693d46" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_019d42b9-20e4-7364-b225-a44105ba557e" 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_019d42b8-102d-77ed-857c-cb14c8194c06" xlink:to="loc_us-gaap_RestrictedStockMember_019d42b9-20e4-7364-b225-a44105ba557e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_RestrictedStockAwardsSubjectToServiceBasedVestingConditionsMember_019df121-16ec-74a6-8607-f075f9521028" xlink:href="soun-20260331.xsd#soun_RestrictedStockAwardsSubjectToServiceBasedVestingConditionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d42b8-102d-77ed-857c-cb14c8194c06" xlink:to="loc_soun_RestrictedStockAwardsSubjectToServiceBasedVestingConditionsMember_019df121-16ec-74a6-8607-f075f9521028" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_RestrictedStockAwardsSubjectToPerformanceBasedVestingConditionsMember_019df122-60b0-7803-947b-bc33efdbe2e6" xlink:href="soun-20260331.xsd#soun_RestrictedStockAwardsSubjectToPerformanceBasedVestingConditionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d42b8-102d-77ed-857c-cb14c8194c06" xlink:to="loc_soun_RestrictedStockAwardsSubjectToPerformanceBasedVestingConditionsMember_019df122-60b0-7803-947b-bc33efdbe2e6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_019d42b8-102d-72c5-806f-c29d4d86a0e4" 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_019d3f8c-d025-7deb-b812-c23eaf8ba27f" xlink:to="loc_us-gaap_VestingAxis_019d42b8-102d-72c5-806f-c29d4d86a0e4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_019d42b8-102d-72c5-806f-c29d4d86a0e4_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_019d42b8-102d-72c5-806f-c29d4d86a0e4" xlink:to="loc_us-gaap_VestingDomain_019d42b8-102d-72c5-806f-c29d4d86a0e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_019d42b8-102d-790d-a5ca-a27db98931c1" 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_019d42b8-102d-72c5-806f-c29d4d86a0e4" xlink:to="loc_us-gaap_VestingDomain_019d42b8-102d-790d-a5ca-a27db98931c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_019d42b8-102d-703b-ac48-3ac73c0cae4f" 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_019d42b8-102d-790d-a5ca-a27db98931c1" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_019d42b8-102d-703b-ac48-3ac73c0cae4f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_019d42b8-102d-78d0-8867-4351bf68c72f" 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_019d42b8-102d-790d-a5ca-a27db98931c1" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_019d42b8-102d-78d0-8867-4351bf68c72f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_019d42b8-102d-7c1e-b223-116098206392" 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_019d42b8-102d-790d-a5ca-a27db98931c1" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_019d42b8-102d-7c1e-b223-116098206392" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019d42b8-102d-7c34-81ce-fffee17fad19" 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_019d3f8c-d025-7deb-b812-c23eaf8ba27f" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019d42b8-102d-7c34-81ce-fffee17fad19" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d42b8-102d-7c34-81ce-fffee17fad19_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_019d42b8-102d-7c34-81ce-fffee17fad19" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d42b8-102d-7c34-81ce-fffee17fad19_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d42b8-102d-7c1e-9d8f-ae933147bc88" 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_019d42b8-102d-7c34-81ce-fffee17fad19" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d42b8-102d-7c1e-9d8f-ae933147bc88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SYNQ3IncMember_019d42b8-102d-7967-84ab-5518b3c95709" xlink:href="soun-20260331.xsd#soun_SYNQ3IncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d42b8-102d-7c1e-9d8f-ae933147bc88" xlink:to="loc_soun_SYNQ3IncMember_019d42b8-102d-7967-84ab-5518b3c95709" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_019d42b8-102d-7340-ac0b-195faccd5f68" 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_019d3f8c-d025-7deb-b812-c23eaf8ba27f" xlink:to="loc_srt_StatementScenarioAxis_019d42b8-102d-7340-ac0b-195faccd5f68" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019d42b8-102d-7340-ac0b-195faccd5f68_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_019d42b8-102d-7340-ac0b-195faccd5f68" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019d42b8-102d-7340-ac0b-195faccd5f68_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019d42b8-102d-7e27-a300-cfec65735cfb" 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_019d42b8-102d-7340-ac0b-195faccd5f68" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019d42b8-102d-7e27-a300-cfec65735cfb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_019d42b8-102d-76a7-9956-e8ebafd95ef1" 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_019d42b8-102d-7e27-a300-cfec65735cfb" xlink:to="loc_srt_ScenarioForecastMember_019d42b8-102d-76a7-9956-e8ebafd95ef1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019d42b8-102d-7848-acca-716c8b28b3f4" 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_019d3f8c-d025-7deb-b812-c23eaf8ba27f" xlink:to="loc_srt_RangeAxis_019d42b8-102d-7848-acca-716c8b28b3f4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019d42b8-102d-7848-acca-716c8b28b3f4_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_019d42b8-102d-7848-acca-716c8b28b3f4" xlink:to="loc_srt_RangeMember_019d42b8-102d-7848-acca-716c8b28b3f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019d42b8-102d-756d-98f4-c11e93a94151" 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_019d42b8-102d-7848-acca-716c8b28b3f4" xlink:to="loc_srt_RangeMember_019d42b8-102d-756d-98f4-c11e93a94151" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019d42b8-102d-7e0b-94bc-3c6000bdf193" 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_019d42b8-102d-756d-98f4-c11e93a94151" xlink:to="loc_srt_MinimumMember_019d42b8-102d-7e0b-94bc-3c6000bdf193" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019d42b8-102d-7c28-8c4e-ca6d032d57dd" 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_019d42b8-102d-756d-98f4-c11e93a94151" xlink:to="loc_srt_MaximumMember_019d42b8-102d-7c28-8c4e-ca6d032d57dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusAxis_019d42b8-102d-7462-923c-1eddfd52173b" 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_019d3f8c-d025-7deb-b812-c23eaf8ba27f" xlink:to="loc_us-gaap_GranteeStatusAxis_019d42b8-102d-7462-923c-1eddfd52173b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_019d42b8-102d-7462-923c-1eddfd52173b_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_019d42b8-102d-7462-923c-1eddfd52173b" xlink:to="loc_us-gaap_GranteeStatusDomain_019d42b8-102d-7462-923c-1eddfd52173b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GranteeStatusDomain_019d42b8-102d-7fbd-8d37-4337646d91b7" 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_019d42b8-102d-7462-923c-1eddfd52173b" xlink:to="loc_us-gaap_GranteeStatusDomain_019d42b8-102d-7fbd-8d37-4337646d91b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_GranteeStatusInteractionsEmployeesMember_019d42b8-102d-74b2-aa51-fd5d693d155b" xlink:href="soun-20260331.xsd#soun_GranteeStatusInteractionsEmployeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GranteeStatusDomain_019d42b8-102d-7fbd-8d37-4337646d91b7" xlink:to="loc_soun_GranteeStatusInteractionsEmployeesMember_019d42b8-102d-74b2-aa51-fd5d693d155b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_GranteeStatusAmeliaEmployeesMember_019db3e0-7d58-7cf2-98e1-e420a33b858a" xlink:href="soun-20260331.xsd#soun_GranteeStatusAmeliaEmployeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GranteeStatusDomain_019d42b8-102d-7fbd-8d37-4337646d91b7" xlink:to="loc_soun_GranteeStatusAmeliaEmployeesMember_019db3e0-7d58-7cf2-98e1-e420a33b858a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedPaymentArrangementEmployeeMember_019d42b8-102d-7887-b932-bb5b9efc42e0" 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_019d42b8-102d-7fbd-8d37-4337646d91b7" xlink:to="loc_us-gaap_ShareBasedPaymentArrangementEmployeeMember_019d42b8-102d-7887-b932-bb5b9efc42e0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_019d3f8c-d025-7c18-ad8e-6800637dfe27" 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_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_019d3f8c-d025-7c18-ad8e-6800637dfe27" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_019d3f8c-d025-7c66-95c4-812d56909d7d" 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_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_019d3f8c-d025-7c66-95c4-812d56909d7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum_019d3f8c-d025-77dd-a5e9-0d19335c7cd2" 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_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum_019d3f8c-d025-77dd-a5e9-0d19335c7cd2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_EmployeeStockPurchasePlanSharesReservedForIssuancePeriodSubjectToIncrease_019d3f8c-d025-7881-84ca-22d8877d3b32" xlink:href="soun-20260331.xsd#soun_EmployeeStockPurchasePlanSharesReservedForIssuancePeriodSubjectToIncrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_soun_EmployeeStockPurchasePlanSharesReservedForIssuancePeriodSubjectToIncrease_019d3f8c-d025-7881-84ca-22d8877d3b32" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_019d3f8c-d025-7850-972b-364d86d1b938" 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_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_019d3f8c-d025-7850-972b-364d86d1b938" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_AggregateSharePercentageAsPercentageOfSharesOutstanding_019d3f8c-d025-7c68-8322-c48ed10a1007" xlink:href="soun-20260331.xsd#soun_AggregateSharePercentageAsPercentageOfSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_soun_AggregateSharePercentageAsPercentageOfSharesOutstanding_019d3f8c-d025-7c68-8322-c48ed10a1007" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_EmployeeStockPurchasePlanAggregateNumberIncrementalPeriod_019d3f8c-d025-7172-be50-d8a5939ff827" xlink:href="soun-20260331.xsd#soun_EmployeeStockPurchasePlanAggregateNumberIncrementalPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_soun_EmployeeStockPurchasePlanAggregateNumberIncrementalPeriod_019d3f8c-d025-7172-be50-d8a5939ff827" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_EmployeeStockPurchasePlanOfferingPeriod_019d3f8c-d025-72e8-940d-f7b9a5c619a2" xlink:href="soun-20260331.xsd#soun_EmployeeStockPurchasePlanOfferingPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_soun_EmployeeStockPurchasePlanOfferingPeriod_019d3f8c-d025-72e8-940d-f7b9a5c619a2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_PercentageOfFairMarketValueAShare_019d3f8c-d025-77cc-b20f-2b1fe7df8611" xlink:href="soun-20260331.xsd#soun_PercentageOfFairMarketValueAShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_soun_PercentageOfFairMarketValueAShare_019d3f8c-d025-77cc-b20f-2b1fe7df8611" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_EmployeeStockPurchasePlanLookBackPeriod_019d3f8c-d025-7b57-86b1-2939a7bb33d4" xlink:href="soun-20260331.xsd#soun_EmployeeStockPurchasePlanLookBackPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_soun_EmployeeStockPurchasePlanLookBackPeriod_019d3f8c-d025-7b57-86b1-2939a7bb33d4" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_019d3f8c-d025-79ea-bf84-91dcffe64383" 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_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_019d3f8c-d025-79ea-bf84-91dcffe64383" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_019d3f8d-787c-71f9-b4a0-5f451d14b5c6" 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_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_019d3f8d-787c-71f9-b4a0-5f451d14b5c6" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019d3f8d-787c-7074-a852-0d4c814f6534" 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_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019d3f8d-787c-7074-a852-0d4c814f6534" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_019d3f8d-787c-7aac-b26b-b37d967e02b8" 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_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_019d3f8d-787c-7aac-b26b-b37d967e02b8" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_019d3f8d-787c-7485-bdab-19e8de086477" 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_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_019d3f8d-787c-7485-bdab-19e8de086477" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019d3f8d-787c-76a4-9eef-11d02a84b783" 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_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019d3f8d-787c-76a4-9eef-11d02a84b783" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_019d3f8d-787c-79f1-b2a5-f49104d3acb7" 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_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_019d3f8d-787c-79f1-b2a5-f49104d3acb7" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019d3f8d-787c-74f5-ac28-f57f88281b39" 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_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019d3f8d-787c-74f5-ac28-f57f88281b39" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsRevenueTarget_019d3f8d-787c-7a90-963d-e708f94c9af0" xlink:href="soun-20260331.xsd#soun_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsRevenueTarget"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_soun_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsRevenueTarget_019d3f8d-787c-7a90-963d-e708f94c9af0" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_019d3f8e-42f4-7a9d-a090-becad02d3527" 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_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_019d3f8e-42f4-7a9d-a090-becad02d3527" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingNumberOfVestingTranches_019d3f8e-c6ae-7ac5-98c9-713633e89109" xlink:href="soun-20260331.xsd#soun_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingNumberOfVestingTranches"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_soun_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingNumberOfVestingTranches_019d3f8e-c6ae-7ac5-98c9-713633e89109" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019d87d5-dcdf-73f4-ba27-294f6c203c97" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019d87d5-dcdf-73f4-ba27-294f6c203c97" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019d87d5-dcdf-7547-8fb7-0110c4c82a68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d3f8c-d025-762e-ac72-c79107214edd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019d87d5-dcdf-7547-8fb7-0110c4c82a68" xlink:type="arc" order="22"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/STOCKINCENTIVEPLANSScheduleofOperationsandComprehensiveLossDetails" xlink:type="simple" xlink:href="soun-20260331.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_019cb0a3-0037-72b3-ad33-ec8d8bf64690" 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_019cb0a3-0037-7f20-b0ed-16bd4131b1df" 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_019cb0a3-0037-72b3-ad33-ec8d8bf64690" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019cb0a3-0037-7f20-b0ed-16bd4131b1df" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_019cb0a3-0037-7ae7-b0e9-04af9305bd8a" 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_019cb0a3-0037-7f20-b0ed-16bd4131b1df" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_019cb0a3-0037-7ae7-b0e9-04af9305bd8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019cb0a3-0037-7ae7-b0e9-04af9305bd8a_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_019cb0a3-0037-7ae7-b0e9-04af9305bd8a" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019cb0a3-0037-7ae7-b0e9-04af9305bd8a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019cb0a3-0037-7c44-89c8-f0cde4facbd9" 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_019cb0a3-0037-7ae7-b0e9-04af9305bd8a" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019cb0a3-0037-7c44-89c8-f0cde4facbd9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_019cb0a3-0037-7051-852a-5913b42422de" 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_019cb0a3-0037-7c44-89c8-f0cde4facbd9" xlink:to="loc_us-gaap_CostOfSalesMember_019cb0a3-0037-7051-852a-5913b42422de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_019cb0a3-0037-734c-9a99-0e470ab6611a" 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_019cb0a3-0037-7c44-89c8-f0cde4facbd9" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_019cb0a3-0037-734c-9a99-0e470ab6611a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_019cb0a3-0037-7771-b7a1-44ce6523e380" 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_019cb0a3-0037-7c44-89c8-f0cde4facbd9" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_019cb0a3-0037-7771-b7a1-44ce6523e380" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_019cb0a3-0037-77a6-8258-c7e588af8e0d" 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_019cb0a3-0037-7c44-89c8-f0cde4facbd9" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_019cb0a3-0037-77a6-8258-c7e588af8e0d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_CapitalizedSoftwareDevelopmentCostsMember_019db37e-903e-7fbb-86de-e6aa3aa98a36" xlink:href="soun-20260331.xsd#soun_CapitalizedSoftwareDevelopmentCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019cb0a3-0037-7c44-89c8-f0cde4facbd9" xlink:to="loc_soun_CapitalizedSoftwareDevelopmentCostsMember_019db37e-903e-7fbb-86de-e6aa3aa98a36" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019cb0a3-0037-7d72-be98-4b45e33ad23f" 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_019cb0a3-0037-72b3-ad33-ec8d8bf64690" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019cb0a3-0037-7d72-be98-4b45e33ad23f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/NETINCOMELOSSPERSHAREScheduleofOutstandingSharesofPotentiallyDilutiveSecuritiesDetails" xlink:type="simple" xlink:href="soun-20260331.xsd#NETINCOMELOSSPERSHAREScheduleofOutstandingSharesofPotentiallyDilutiveSecuritiesDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/NETINCOMELOSSPERSHAREScheduleofOutstandingSharesofPotentiallyDilutiveSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019cb0a3-0037-7725-99f3-6ae0471361c8" 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_019cb0a3-0037-7d35-beb4-73a4ec92c631" 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_019cb0a3-0037-7725-99f3-6ae0471361c8" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019cb0a3-0037-7d35-beb4-73a4ec92c631" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019cb0a3-0037-7ae9-acb5-ca948326ae75" 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_019cb0a3-0037-7d35-beb4-73a4ec92c631" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019cb0a3-0037-7ae9-acb5-ca948326ae75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cb0a3-0037-7ae9-acb5-ca948326ae75_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_019cb0a3-0037-7ae9-acb5-ca948326ae75" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cb0a3-0037-7ae9-acb5-ca948326ae75_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cb0a3-0037-79e3-b8b9-91b9ec5c5602" 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_019cb0a3-0037-7ae9-acb5-ca948326ae75" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cb0a3-0037-79e3-b8b9-91b9ec5c5602" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockCompensationPlanMember_019cb0a3-0037-7996-8d9e-22f4aa143a2e" 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_019cb0a3-0037-79e3-b8b9-91b9ec5c5602" xlink:to="loc_us-gaap_StockCompensationPlanMember_019cb0a3-0037-7996-8d9e-22f4aa143a2e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_UnvestedRestrictedShareMember_019cb0a3-0037-7d86-9a01-c29eeed9572a" xlink:href="soun-20260331.xsd#soun_UnvestedRestrictedShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cb0a3-0037-79e3-b8b9-91b9ec5c5602" xlink:to="loc_soun_UnvestedRestrictedShareMember_019cb0a3-0037-7d86-9a01-c29eeed9572a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentlyIssuableSharesMember_019db386-f3f0-7da0-9f46-51c1a2e4bffa" xlink:href="soun-20260331.xsd#soun_ContingentlyIssuableSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cb0a3-0037-79e3-b8b9-91b9ec5c5602" xlink:to="loc_soun_ContingentlyIssuableSharesMember_019db386-f3f0-7da0-9f46-51c1a2e4bffa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019cb0a3-0037-742c-8c6c-3aa67868a604" 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_019cb0a3-0037-7725-99f3-6ae0471361c8" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019cb0a3-0037-742c-8c6c-3aa67868a604" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/NETINCOMELOSSPERSHARENarrativeDetails" xlink:type="simple" xlink:href="soun-20260331.xsd#NETINCOMELOSSPERSHARENarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/NETINCOMELOSSPERSHARENarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019cb0a3-0037-73d8-b50b-e862d454070b" 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_019cb0a3-0037-7a97-b628-55b2b8fe04c6" 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_019cb0a3-0037-73d8-b50b-e862d454070b" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019cb0a3-0037-7a97-b628-55b2b8fe04c6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019d42ce-c708-71e2-9962-05fd5fd1a320" 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_019cb0a3-0037-7a97-b628-55b2b8fe04c6" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019d42ce-c708-71e2-9962-05fd5fd1a320" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019d42ce-c708-71e2-9962-05fd5fd1a320_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_019d42ce-c708-71e2-9962-05fd5fd1a320" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019d42ce-c708-71e2-9962-05fd5fd1a320_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019d42ce-c708-79ad-b16a-00ad691dfef2" 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_019d42ce-c708-71e2-9962-05fd5fd1a320" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019d42ce-c708-79ad-b16a-00ad691dfef2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ShareBasedPaymentArrangementAndRestrictedStockMember_019d42ce-c708-7036-9b9d-e0a5533b2632" xlink:href="soun-20260331.xsd#soun_ShareBasedPaymentArrangementAndRestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019d42ce-c708-79ad-b16a-00ad691dfef2" xlink:to="loc_soun_ShareBasedPaymentArrangementAndRestrictedStockMember_019d42ce-c708-7036-9b9d-e0a5533b2632" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentlyIssuableSharesMember_019d42ce-c708-7784-85b7-736bf346d846" xlink:href="soun-20260331.xsd#soun_ContingentlyIssuableSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019d42ce-c708-79ad-b16a-00ad691dfef2" xlink:to="loc_soun_ContingentlyIssuableSharesMember_019d42ce-c708-7784-85b7-736bf346d846" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentlyReturnableSharesMember_019d42ce-c708-7ba3-81e7-959b894f754c" xlink:href="soun-20260331.xsd#soun_ContingentlyReturnableSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019d42ce-c708-79ad-b16a-00ad691dfef2" xlink:to="loc_soun_ContingentlyReturnableSharesMember_019d42ce-c708-7ba3-81e7-959b894f754c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_019d42ce-c708-788b-b748-8a06742b9572" 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_019cb0a3-0037-7a97-b628-55b2b8fe04c6" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_019d42ce-c708-788b-b748-8a06742b9572" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_019d42ce-c708-788b-b748-8a06742b9572_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_019d42ce-c708-788b-b748-8a06742b9572" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_019d42ce-c708-788b-b748-8a06742b9572_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_019d42ce-c708-7d41-a67d-de607b3e1cb8" 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_019d42ce-c708-788b-b748-8a06742b9572" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_019d42ce-c708-7d41-a67d-de607b3e1cb8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationEarnoutLiabilityMember_019d42ce-c708-7bbe-827a-f4f67cbb933e" xlink:href="soun-20260331.xsd#soun_ContingentConsiderationEarnoutLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019d42ce-c708-7d41-a67d-de607b3e1cb8" xlink:to="loc_soun_ContingentConsiderationEarnoutLiabilityMember_019d42ce-c708-7bbe-827a-f4f67cbb933e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_EscrowConsiderationWithholdingMember_019d42ce-c708-71df-a506-5c5ca2474d24" xlink:href="soun-20260331.xsd#soun_EscrowConsiderationWithholdingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019d42ce-c708-7d41-a67d-de607b3e1cb8" xlink:to="loc_soun_EscrowConsiderationWithholdingMember_019d42ce-c708-71df-a506-5c5ca2474d24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019d42ce-c708-7196-ae65-74060c9954ed" 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_019cb0a3-0037-7a97-b628-55b2b8fe04c6" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019d42ce-c708-7196-ae65-74060c9954ed" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019d42ce-c708-7196-ae65-74060c9954ed_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_019d42ce-c708-7196-ae65-74060c9954ed" xlink:to="loc_us-gaap_ClassOfStockDomain_019d42ce-c708-7196-ae65-74060c9954ed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019d42ce-c708-71b8-a897-a90a5a7da272" 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_019d42ce-c708-7196-ae65-74060c9954ed" xlink:to="loc_us-gaap_ClassOfStockDomain_019d42ce-c708-71b8-a897-a90a5a7da272" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019d42ce-c709-7194-87f7-eb55e8e3aa07" 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_019d42ce-c708-71b8-a897-a90a5a7da272" xlink:to="loc_us-gaap_CommonClassAMember_019d42ce-c709-7194-87f7-eb55e8e3aa07" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_AntidilutiveSecuritiesExcludedFromComputationOfBasicEarningsEachShareAmount_019dfd83-ca7d-75ad-83bc-913e21ed8855" xlink:href="soun-20260331.xsd#soun_AntidilutiveSecuritiesExcludedFromComputationOfBasicEarningsEachShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019cb0a3-0037-73d8-b50b-e862d454070b" xlink:to="loc_soun_AntidilutiveSecuritiesExcludedFromComputationOfBasicEarningsEachShareAmount_019dfd83-ca7d-75ad-83bc-913e21ed8855" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019cb0a3-0037-7b78-890e-a421480320db" 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_019cb0a3-0037-73d8-b50b-e862d454070b" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019cb0a3-0037-7b78-890e-a421480320db" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/FAIRVALUEMEASUREMENTScheduleofFinancialInstrumentsMeasuredatFairValueDetails" xlink:type="simple" xlink:href="soun-20260331.xsd#FAIRVALUEMEASUREMENTScheduleofFinancialInstrumentsMeasuredatFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/FAIRVALUEMEASUREMENTScheduleofFinancialInstrumentsMeasuredatFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cb0a3-0037-7dba-99f6-5d00d276962f" 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_019cb0a3-0037-7c17-9ba9-8fd0b2a1642e" 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_019cb0a3-0037-7dba-99f6-5d00d276962f" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cb0a3-0037-7c17-9ba9-8fd0b2a1642e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cb0a3-0037-7969-bc2e-2ff096992d47" 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_019cb0a3-0037-7c17-9ba9-8fd0b2a1642e" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cb0a3-0037-7969-bc2e-2ff096992d47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb0a3-0037-7969-bc2e-2ff096992d47_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_019cb0a3-0037-7969-bc2e-2ff096992d47" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb0a3-0037-7969-bc2e-2ff096992d47_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb0a3-0037-7c0d-bab7-32f6acf9a08a" 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_019cb0a3-0037-7969-bc2e-2ff096992d47" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb0a3-0037-7c0d-bab7-32f6acf9a08a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019cb0a3-0037-7d62-ae34-9866676a01c2" 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_019cb0a3-0037-7c0d-bab7-32f6acf9a08a" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019cb0a3-0037-7d62-ae34-9866676a01c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019cb0a3-0037-76b2-acc3-0340f61bb194" 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_019cb0a3-0037-7c0d-bab7-32f6acf9a08a" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019cb0a3-0037-76b2-acc3-0340f61bb194" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019cb0a3-0037-7ec2-b5e8-da0a758943f1" 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_019cb0a3-0037-7c0d-bab7-32f6acf9a08a" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019cb0a3-0037-7ec2-b5e8-da0a758943f1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAxis_019cb0a3-0037-78cb-b92b-494ef6650a20" 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_019cb0a3-0037-7c17-9ba9-8fd0b2a1642e" xlink:to="loc_us-gaap_CashAndCashEquivalentsAxis_019cb0a3-0037-78cb-b92b-494ef6650a20" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019cb0a3-0037-78cb-b92b-494ef6650a20_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_019cb0a3-0037-78cb-b92b-494ef6650a20" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019cb0a3-0037-78cb-b92b-494ef6650a20_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019cb0a3-0037-79ac-82b4-cf7983850787" 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_019cb0a3-0037-78cb-b92b-494ef6650a20" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019cb0a3-0037-79ac-82b4-cf7983850787" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryBillSecuritiesMember_019cb0a3-0037-716a-b4bf-ad4f5a84b689" 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_019cb0a3-0037-79ac-82b4-cf7983850787" xlink:to="loc_us-gaap_USTreasuryBillSecuritiesMember_019cb0a3-0037-716a-b4bf-ad4f5a84b689" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_019cb0a3-0037-74b9-b6e9-a48abe63ffeb" 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_019cb0a3-0037-79ac-82b4-cf7983850787" xlink:to="loc_us-gaap_MoneyMarketFundsMember_019cb0a3-0037-74b9-b6e9-a48abe63ffeb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_019cb0a3-0037-7d9f-b7fd-1142f7c2bd46" 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_019cb0a3-0037-7c17-9ba9-8fd0b2a1642e" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_019cb0a3-0037-7d9f-b7fd-1142f7c2bd46" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7d9f-b7fd-1142f7c2bd46_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_019cb0a3-0037-7d9f-b7fd-1142f7c2bd46" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7d9f-b7fd-1142f7c2bd46_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-707e-b529-e0e57faba7dc" 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_019cb0a3-0037-7d9f-b7fd-1142f7c2bd46" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-707e-b529-e0e57faba7dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationEarnoutLiabilityMember_019cb0a3-0037-7fb9-99cf-e9fe7ea0c2bf" xlink:href="soun-20260331.xsd#soun_ContingentConsiderationEarnoutLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-707e-b529-e0e57faba7dc" xlink:to="loc_soun_ContingentConsiderationEarnoutLiabilityMember_019cb0a3-0037-7fb9-99cf-e9fe7ea0c2bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019cb0a3-0037-7327-be43-bdf5e1ccb999" 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_019cb0a3-0037-7dba-99f6-5d00d276962f" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019cb0a3-0037-7327-be43-bdf5e1ccb999" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsNoncurrent_019cb0a3-0037-73ef-81de-09adea1c925c" 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_019cb0a3-0037-7dba-99f6-5d00d276962f" xlink:to="loc_us-gaap_DerivativeAssetsNoncurrent_019cb0a3-0037-73ef-81de-09adea1c925c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019cb0a3-0037-7815-9a8a-edcfd302fdad" 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_019cb0a3-0037-7dba-99f6-5d00d276962f" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019cb0a3-0037-7815-9a8a-edcfd302fdad" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_019cb0a3-0037-784f-936e-2e10dff57ebd" 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_019cb0a3-0037-7dba-99f6-5d00d276962f" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_019cb0a3-0037-784f-936e-2e10dff57ebd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_019cb0a3-0037-79dd-ab2e-2c893c325bfb" 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_019cb0a3-0037-7dba-99f6-5d00d276962f" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_019cb0a3-0037-79dd-ab2e-2c893c325bfb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_019cb0a3-0037-731e-83a0-a1cf56af7425" 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_019cb0a3-0037-7dba-99f6-5d00d276962f" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_019cb0a3-0037-731e-83a0-a1cf56af7425" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/FAIRVALUEMEASUREMENTScheduleofFairValueLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationDetails" xlink:type="simple" xlink:href="soun-20260331.xsd#FAIRVALUEMEASUREMENTScheduleofFairValueLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/FAIRVALUEMEASUREMENTScheduleofFairValueLiabilitiesMeasuredonRecurringBasisUnobservableInputReconciliationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cb0a3-0037-720e-b9c5-31efaa9473d4" 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_019cb0a3-0037-7290-a524-10d0f3dbc098" 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_019cb0a3-0037-720e-b9c5-31efaa9473d4" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cb0a3-0037-7290-a524-10d0f3dbc098" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cb0a3-0037-7333-8bb9-fb98b69be7b9" 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_019cb0a3-0037-7290-a524-10d0f3dbc098" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cb0a3-0037-7333-8bb9-fb98b69be7b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb0a3-0037-7333-8bb9-fb98b69be7b9_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_019cb0a3-0037-7333-8bb9-fb98b69be7b9" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb0a3-0037-7333-8bb9-fb98b69be7b9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb0a3-0037-7e82-8638-2da463fea935" 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_019cb0a3-0037-7333-8bb9-fb98b69be7b9" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb0a3-0037-7e82-8638-2da463fea935" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeMember_019cb0a3-0037-72d0-8e3b-4ca15ac92276" 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_019cb0a3-0037-7e82-8638-2da463fea935" xlink:to="loc_us-gaap_DerivativeMember_019cb0a3-0037-72d0-8e3b-4ca15ac92276" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_019cb0a3-0037-7e65-939b-ff329b418b33" 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_019cb0a3-0037-7290-a524-10d0f3dbc098" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_019cb0a3-0037-7e65-939b-ff329b418b33" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7e65-939b-ff329b418b33_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_019cb0a3-0037-7e65-939b-ff329b418b33" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7e65-939b-ff329b418b33_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7fb7-a218-633d0ef8c681" 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_019cb0a3-0037-7e65-939b-ff329b418b33" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7fb7-a218-633d0ef8c681" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_EscrowConsiderationWithholdingMember_019cb0a3-0037-7815-b9cd-395c2625be92" xlink:href="soun-20260331.xsd#soun_EscrowConsiderationWithholdingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7fb7-a218-633d0ef8c681" xlink:to="loc_soun_EscrowConsiderationWithholdingMember_019cb0a3-0037-7815-b9cd-395c2625be92" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationHoldbackLiabilityMember_019cb0a3-0037-74a3-9895-7d389349fdc5" xlink:href="soun-20260331.xsd#soun_ContingentConsiderationHoldbackLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7fb7-a218-633d0ef8c681" xlink:to="loc_soun_ContingentConsiderationHoldbackLiabilityMember_019cb0a3-0037-74a3-9895-7d389349fdc5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationEarnoutLiabilityMember_019cb0a3-0037-77f9-bc92-cd50011aa6bc" xlink:href="soun-20260331.xsd#soun_ContingentConsiderationEarnoutLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7fb7-a218-633d0ef8c681" xlink:to="loc_soun_ContingentConsiderationEarnoutLiabilityMember_019cb0a3-0037-77f9-bc92-cd50011aa6bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019cb0a3-0037-7766-80eb-0f371aa5a805" 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_019cb0a3-0037-720e-b9c5-31efaa9473d4" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019cb0a3-0037-7766-80eb-0f371aa5a805" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019cb0a3-0037-7669-a436-fdd4aa3ad9b8" 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_019cb0a3-0037-7766-80eb-0f371aa5a805" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019cb0a3-0037-7669-a436-fdd4aa3ad9b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_019cb0a3-0037-709c-8e36-b696134039f8" 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_019cb0a3-0037-7766-80eb-0f371aa5a805" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_019cb0a3-0037-709c-8e36-b696134039f8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_019cb0a3-0037-7b43-8073-8ba9699a9881" 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_019cb0a3-0037-7766-80eb-0f371aa5a805" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_019cb0a3-0037-7b43-8073-8ba9699a9881" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019cb0a3-0037-7618-9ad7-e7b9dea54339" 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/FAIRVALUEMEASUREMENTNarrativeDetails" xlink:type="simple" xlink:href="soun-20260331.xsd#FAIRVALUEMEASUREMENTNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/FAIRVALUEMEASUREMENTNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cb0a3-0037-7803-a550-618132c967f8" 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_019cb0a3-0037-7410-a283-69882756f54e" 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_019cb0a3-0037-7803-a550-618132c967f8" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cb0a3-0037-7410-a283-69882756f54e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_019cb0a3-0037-7f9b-8ade-82c8f8bd2cfc" 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_019cb0a3-0037-7410-a283-69882756f54e" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_019cb0a3-0037-7f9b-8ade-82c8f8bd2cfc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7f9b-8ade-82c8f8bd2cfc_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_019cb0a3-0037-7f9b-8ade-82c8f8bd2cfc" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7f9b-8ade-82c8f8bd2cfc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7e71-94ec-4ab83216cd98" 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_019cb0a3-0037-7f9b-8ade-82c8f8bd2cfc" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7e71-94ec-4ab83216cd98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_EscrowConsiderationWithholdingMember_019cb0a3-0037-78d8-8302-d90583538f2f" xlink:href="soun-20260331.xsd#soun_EscrowConsiderationWithholdingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7e71-94ec-4ab83216cd98" xlink:to="loc_soun_EscrowConsiderationWithholdingMember_019cb0a3-0037-78d8-8302-d90583538f2f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationHoldbackLiabilityMember_019cb0a3-0037-7716-8448-a9a6053bb16a" xlink:href="soun-20260331.xsd#soun_ContingentConsiderationHoldbackLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7e71-94ec-4ab83216cd98" xlink:to="loc_soun_ContingentConsiderationHoldbackLiabilityMember_019cb0a3-0037-7716-8448-a9a6053bb16a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationEarnoutLiabilityMember_019cb0a3-0037-70fe-8982-0aa47a605401" xlink:href="soun-20260331.xsd#soun_ContingentConsiderationEarnoutLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7e71-94ec-4ab83216cd98" xlink:to="loc_soun_ContingentConsiderationEarnoutLiabilityMember_019cb0a3-0037-70fe-8982-0aa47a605401" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cb0a3-0037-7863-a7c1-2ccfb420968a" 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_019cb0a3-0037-7410-a283-69882756f54e" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cb0a3-0037-7863-a7c1-2ccfb420968a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb0a3-0037-7863-a7c1-2ccfb420968a_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_019cb0a3-0037-7863-a7c1-2ccfb420968a" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb0a3-0037-7863-a7c1-2ccfb420968a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb0a3-0037-7676-b52a-d14491cd04b7" 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_019cb0a3-0037-7863-a7c1-2ccfb420968a" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb0a3-0037-7676-b52a-d14491cd04b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeMember_019cb0a3-0037-72ea-897f-d8cd8905ab8f" 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_019cb0a3-0037-7676-b52a-d14491cd04b7" xlink:to="loc_us-gaap_DerivativeMember_019cb0a3-0037-72ea-897f-d8cd8905ab8f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_019cb0a3-0037-751c-a41b-66709cf567dc" 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_019cb0a3-0037-7410-a283-69882756f54e" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_019cb0a3-0037-751c-a41b-66709cf567dc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019cb0a3-0037-751c-a41b-66709cf567dc_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_019cb0a3-0037-751c-a41b-66709cf567dc" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019cb0a3-0037-751c-a41b-66709cf567dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019cb0a3-0037-794f-9646-5c8e367d14cf" 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_019cb0a3-0037-751c-a41b-66709cf567dc" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019cb0a3-0037-794f-9646-5c8e367d14cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MeasurementInputHoldbackPeriodMember_019cb0a3-0037-7060-8f6a-702b30f7e8b1" xlink:href="soun-20260331.xsd#soun_MeasurementInputHoldbackPeriodMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cb0a3-0037-794f-9646-5c8e367d14cf" xlink:to="loc_soun_MeasurementInputHoldbackPeriodMember_019cb0a3-0037-7060-8f6a-702b30f7e8b1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputExpectedDividendRateMember_019cb0a3-0037-793e-89a7-81e561659269" 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_019cb0a3-0037-794f-9646-5c8e367d14cf" xlink:to="loc_us-gaap_MeasurementInputExpectedDividendRateMember_019cb0a3-0037-793e-89a7-81e561659269" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019cb0a3-0037-7afc-a541-0bf363eb580d" 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_019cb0a3-0037-7410-a283-69882756f54e" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019cb0a3-0037-7afc-a541-0bf363eb580d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a3-0037-7afc-a541-0bf363eb580d_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_019cb0a3-0037-7afc-a541-0bf363eb580d" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a3-0037-7afc-a541-0bf363eb580d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a3-0037-72ed-a65c-dd9f90a30917" 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_019cb0a3-0037-7afc-a541-0bf363eb580d" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a3-0037-72ed-a65c-dd9f90a30917" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_AmeliaTechnologiesLLCMember_019cb0a3-0037-755d-8f26-bdd6e826076b" xlink:href="soun-20260331.xsd#soun_AmeliaTechnologiesLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a3-0037-72ed-a65c-dd9f90a30917" xlink:to="loc_soun_AmeliaTechnologiesLLCMember_019cb0a3-0037-755d-8f26-bdd6e826076b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SYNQ3IncMember_019d42ed-2d1b-7746-97c1-d24c001459c6" xlink:href="soun-20260331.xsd#soun_SYNQ3IncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a3-0037-72ed-a65c-dd9f90a30917" xlink:to="loc_soun_SYNQ3IncMember_019d42ed-2d1b-7746-97c1-d24c001459c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionSharePrice_019cb0a3-0037-71ab-aa92-040254f34b76" 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_019cb0a3-0037-7803-a550-618132c967f8" xlink:to="loc_us-gaap_BusinessAcquisitionSharePrice_019cb0a3-0037-71ab-aa92-040254f34b76" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_019cb0a3-0037-7cf2-abfd-edc6c348e5c8" 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_019cb0a3-0037-7803-a550-618132c967f8" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_019cb0a3-0037-7cf2-abfd-edc6c348e5c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_BusinessCombinationContingentConsiderationLiabilityHoldbackPeriod_019cb0a3-0037-726a-898a-76760ba0efde" xlink:href="soun-20260331.xsd#soun_BusinessCombinationContingentConsiderationLiabilityHoldbackPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cb0a3-0037-7803-a550-618132c967f8" xlink:to="loc_soun_BusinessCombinationContingentConsiderationLiabilityHoldbackPeriod_019cb0a3-0037-726a-898a-76760ba0efde" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_019cb0a3-0037-7692-bbb0-0a28760e5c87" 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_019cb0a3-0037-7803-a550-618132c967f8" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_019cb0a3-0037-7692-bbb0-0a28760e5c87" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/FAIRVALUEMEASUREMENTScheduleofHoldbackLiabilityDetails" xlink:type="simple" xlink:href="soun-20260331.xsd#FAIRVALUEMEASUREMENTScheduleofHoldbackLiabilityDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/FAIRVALUEMEASUREMENTScheduleofHoldbackLiabilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cb0a3-0037-7dab-a628-fd31c870525e" 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_019cb0a3-0037-73e7-a1e2-0d486107a088" 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_019cb0a3-0037-7dab-a628-fd31c870525e" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cb0a3-0037-73e7-a1e2-0d486107a088" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_019cb0a3-0037-7cf4-816b-e133be430d1e" 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_019cb0a3-0037-73e7-a1e2-0d486107a088" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_019cb0a3-0037-7cf4-816b-e133be430d1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7cf4-816b-e133be430d1e_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_019cb0a3-0037-7cf4-816b-e133be430d1e" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7cf4-816b-e133be430d1e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-752a-b8a7-2be309cb26f8" 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_019cb0a3-0037-7cf4-816b-e133be430d1e" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-752a-b8a7-2be309cb26f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationHoldbackLiabilityMember_019cb0a3-0037-7512-92eb-b764dcb39dac" xlink:href="soun-20260331.xsd#soun_ContingentConsiderationHoldbackLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-752a-b8a7-2be309cb26f8" xlink:to="loc_soun_ContingentConsiderationHoldbackLiabilityMember_019cb0a3-0037-7512-92eb-b764dcb39dac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_019cb0a3-0037-7357-8bab-e6b258dda6e4" 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_019cb0a3-0037-73e7-a1e2-0d486107a088" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_019cb0a3-0037-7357-8bab-e6b258dda6e4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019cb0a3-0037-7357-8bab-e6b258dda6e4_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_019cb0a3-0037-7357-8bab-e6b258dda6e4" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019cb0a3-0037-7357-8bab-e6b258dda6e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019cb0a3-0037-77ee-b0a0-953b0481b091" 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_019cb0a3-0037-7357-8bab-e6b258dda6e4" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019cb0a3-0037-77ee-b0a0-953b0481b091" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputRiskFreeInterestRateMember_019cb0a3-0037-7639-b7d2-1f8f8fff282e" 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_019cb0a3-0037-77ee-b0a0-953b0481b091" xlink:to="loc_us-gaap_MeasurementInputRiskFreeInterestRateMember_019cb0a3-0037-7639-b7d2-1f8f8fff282e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MeasurementInputHoldbackPeriodMember_019cb0a3-0037-7640-9a7b-4387063cb0ea" xlink:href="soun-20260331.xsd#soun_MeasurementInputHoldbackPeriodMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cb0a3-0037-77ee-b0a0-953b0481b091" xlink:to="loc_soun_MeasurementInputHoldbackPeriodMember_019cb0a3-0037-7640-9a7b-4387063cb0ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_019cb0a3-0037-77b0-bb96-1de02709fa39" 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_019cb0a3-0037-7dab-a628-fd31c870525e" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_019cb0a3-0037-77b0-bb96-1de02709fa39" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/FAIRVALUEMEASUREMENTScheduleofEarnoutLiabilityDetails" xlink:type="simple" xlink:href="soun-20260331.xsd#FAIRVALUEMEASUREMENTScheduleofEarnoutLiabilityDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/FAIRVALUEMEASUREMENTScheduleofEarnoutLiabilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cb0a3-0037-777f-b57c-45b39dc8786a" 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_019cb0a3-0037-7880-9f01-0f8278385de7" 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_019cb0a3-0037-777f-b57c-45b39dc8786a" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cb0a3-0037-7880-9f01-0f8278385de7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationByTypeAxis_019cb0a3-0037-7b7c-8432-6f8979a48786" 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_019cb0a3-0037-7880-9f01-0f8278385de7" xlink:to="loc_us-gaap_ContingentConsiderationByTypeAxis_019cb0a3-0037-7b7c-8432-6f8979a48786" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7b7c-8432-6f8979a48786_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_019cb0a3-0037-7b7c-8432-6f8979a48786" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7b7c-8432-6f8979a48786_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7e46-968d-b4661b4fb712" 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_019cb0a3-0037-7b7c-8432-6f8979a48786" xlink:to="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7e46-968d-b4661b4fb712" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ContingentConsiderationEarnoutLiabilityMember_019cb0a3-0037-7c0c-afee-6fee66464bed" xlink:href="soun-20260331.xsd#soun_ContingentConsiderationEarnoutLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContingentConsiderationTypeDomain_019cb0a3-0037-7e46-968d-b4661b4fb712" xlink:to="loc_soun_ContingentConsiderationEarnoutLiabilityMember_019cb0a3-0037-7c0c-afee-6fee66464bed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_019cb0a3-0037-75d6-9b6f-8c66c82d44b3" 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_019cb0a3-0037-7880-9f01-0f8278385de7" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_019cb0a3-0037-75d6-9b6f-8c66c82d44b3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019cb0a3-0037-75d6-9b6f-8c66c82d44b3_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_019cb0a3-0037-75d6-9b6f-8c66c82d44b3" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019cb0a3-0037-75d6-9b6f-8c66c82d44b3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019cb0a3-0037-7d90-a27a-b1dd8be7cfe7" 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_019cb0a3-0037-75d6-9b6f-8c66c82d44b3" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019cb0a3-0037-7d90-a27a-b1dd8be7cfe7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_019cb0a3-0037-7d10-9516-25f07d43f930" 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_019cb0a3-0037-7d90-a27a-b1dd8be7cfe7" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_019cb0a3-0037-7d10-9516-25f07d43f930" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputPriceVolatilityMember_019cb0a3-0037-7d31-849d-38dab376e4f8" 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_019cb0a3-0037-7d90-a27a-b1dd8be7cfe7" xlink:to="loc_us-gaap_MeasurementInputPriceVolatilityMember_019cb0a3-0037-7d31-849d-38dab376e4f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputRiskFreeInterestRateMember_019cb0a3-0037-7bc1-af7b-39a17c6e4a7b" 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_019cb0a3-0037-7d90-a27a-b1dd8be7cfe7" xlink:to="loc_us-gaap_MeasurementInputRiskFreeInterestRateMember_019cb0a3-0037-7bc1-af7b-39a17c6e4a7b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputExpectedDividendRateMember_019cb0a3-0037-7ca0-b686-7bcb92fb8dcd" 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_019cb0a3-0037-7d90-a27a-b1dd8be7cfe7" xlink:to="loc_us-gaap_MeasurementInputExpectedDividendRateMember_019cb0a3-0037-7ca0-b686-7bcb92fb8dcd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputExpectedTermMember_019cb0a3-0037-7d8e-825e-e33d0e8bacc6" 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_019cb0a3-0037-7d90-a27a-b1dd8be7cfe7" xlink:to="loc_us-gaap_MeasurementInputExpectedTermMember_019cb0a3-0037-7d8e-825e-e33d0e8bacc6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MeasurementInputEarnoutPaymentDiscountRateMember_019cb0a3-0037-7fb9-8051-a91e7a5426be" xlink:href="soun-20260331.xsd#soun_MeasurementInputEarnoutPaymentDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cb0a3-0037-7d90-a27a-b1dd8be7cfe7" xlink:to="loc_soun_MeasurementInputEarnoutPaymentDiscountRateMember_019cb0a3-0037-7fb9-8051-a91e7a5426be" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MeasurementInputMetricVolatilityMember_019cb0a3-0037-7542-9beb-d618a39c1139" xlink:href="soun-20260331.xsd#soun_MeasurementInputMetricVolatilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cb0a3-0037-7d90-a27a-b1dd8be7cfe7" xlink:to="loc_soun_MeasurementInputMetricVolatilityMember_019cb0a3-0037-7542-9beb-d618a39c1139" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MeasurementInputRiskFreeInterestRateStockPriceMember_019cb0a3-0037-7bf4-8ce4-d14ad46f1b1a" xlink:href="soun-20260331.xsd#soun_MeasurementInputRiskFreeInterestRateStockPriceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cb0a3-0037-7d90-a27a-b1dd8be7cfe7" xlink:to="loc_soun_MeasurementInputRiskFreeInterestRateStockPriceMember_019cb0a3-0037-7bf4-8ce4-d14ad46f1b1a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019cb0a3-0037-7f39-80fe-9d7da759a333" 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_019cb0a3-0037-7880-9f01-0f8278385de7" xlink:to="loc_srt_RangeAxis_019cb0a3-0037-7f39-80fe-9d7da759a333" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cb0a3-0037-7f39-80fe-9d7da759a333_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_019cb0a3-0037-7f39-80fe-9d7da759a333" xlink:to="loc_srt_RangeMember_019cb0a3-0037-7f39-80fe-9d7da759a333_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cb0a3-0037-7f1d-8628-c01b7dc5edad" 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_019cb0a3-0037-7f39-80fe-9d7da759a333" xlink:to="loc_srt_RangeMember_019cb0a3-0037-7f1d-8628-c01b7dc5edad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019cb0a3-0037-75e8-8861-675a5d6008a2" 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_019cb0a3-0037-7f1d-8628-c01b7dc5edad" xlink:to="loc_srt_MinimumMember_019cb0a3-0037-75e8-8861-675a5d6008a2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019cb0a3-0037-74ea-bf8f-2bd8ec72e9a1" 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_019cb0a3-0037-7f1d-8628-c01b7dc5edad" xlink:to="loc_srt_MaximumMember_019cb0a3-0037-74ea-bf8f-2bd8ec72e9a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019cb0a3-0037-7098-b5fb-e590ee780de9" 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_019cb0a3-0037-7880-9f01-0f8278385de7" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019cb0a3-0037-7098-b5fb-e590ee780de9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a3-0037-7098-b5fb-e590ee780de9_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_019cb0a3-0037-7098-b5fb-e590ee780de9" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a3-0037-7098-b5fb-e590ee780de9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a3-0037-7dfe-94ef-e613e5b7bd72" 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_019cb0a3-0037-7098-b5fb-e590ee780de9" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a3-0037-7dfe-94ef-e613e5b7bd72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SYNQ3IncMember_019d42e5-a28a-7a2d-8e6c-a8bf5f48d615" xlink:href="soun-20260331.xsd#soun_SYNQ3IncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a3-0037-7dfe-94ef-e613e5b7bd72" xlink:to="loc_soun_SYNQ3IncMember_019d42e5-a28a-7a2d-8e6c-a8bf5f48d615" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_AmeliaTechnologiesLLCMember_019cb0a3-0037-7b5c-b8ca-ea498c59f95e" xlink:href="soun-20260331.xsd#soun_AmeliaTechnologiesLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a3-0037-7dfe-94ef-e613e5b7bd72" xlink:to="loc_soun_AmeliaTechnologiesLLCMember_019cb0a3-0037-7b5c-b8ca-ea498c59f95e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_InteractionsAcquisitionMember_019cb0a3-0037-7d2b-8608-238d4de4018a" xlink:href="soun-20260331.xsd#soun_InteractionsAcquisitionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb0a3-0037-7dfe-94ef-e613e5b7bd72" xlink:to="loc_soun_InteractionsAcquisitionMember_019cb0a3-0037-7d2b-8608-238d4de4018a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_019cb0a3-0037-7bae-a354-e4cc775eb2d4" 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_019cb0a3-0037-777f-b57c-45b39dc8786a" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_019cb0a3-0037-7bae-a354-e4cc775eb2d4" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/SEGMENTINFORMATIONDetails" xlink:type="simple" xlink:href="soun-20260331.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_019cb0a3-00e9-7353-baf1-0fa3e3227dc4" 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_019cb0a3-00e9-7607-aeaf-a74a17545389" 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_019cb0a3-00e9-7353-baf1-0fa3e3227dc4" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cb0a3-00e9-7607-aeaf-a74a17545389" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cb0a3-00e9-7d48-a9b6-ed679ac42fe4" 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_019cb0a3-00e9-7607-aeaf-a74a17545389" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cb0a3-00e9-7d48-a9b6-ed679ac42fe4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cb0a3-00e9-7d48-a9b6-ed679ac42fe4_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_019cb0a3-00e9-7d48-a9b6-ed679ac42fe4" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cb0a3-00e9-7d48-a9b6-ed679ac42fe4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cb0a3-00e9-74c9-9110-e706cd561dd1" 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_019cb0a3-00e9-7d48-a9b6-ed679ac42fe4" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cb0a3-00e9-74c9-9110-e706cd561dd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_OperatingExpensesBenchmarkMember_019cb0a3-00e9-7056-98ac-c09d1bc6e6d2" xlink:href="soun-20260331.xsd#soun_OperatingExpensesBenchmarkMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cb0a3-00e9-74c9-9110-e706cd561dd1" xlink:to="loc_soun_OperatingExpensesBenchmarkMember_019cb0a3-00e9-7056-98ac-c09d1bc6e6d2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019cb0a3-00e9-7db4-8dee-a0090f4b2b42" 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_019cb0a3-00e9-7607-aeaf-a74a17545389" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019cb0a3-00e9-7db4-8dee-a0090f4b2b42" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019cb0a3-00e9-7db4-8dee-a0090f4b2b42_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_019cb0a3-00e9-7db4-8dee-a0090f4b2b42" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019cb0a3-00e9-7db4-8dee-a0090f4b2b42_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019cb0a3-00e9-78fe-ab40-ab05617630af" 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_019cb0a3-00e9-7db4-8dee-a0090f4b2b42" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019cb0a3-00e9-78fe-ab40-ab05617630af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborForceConcentrationRiskMember_019cb0a3-00e9-785a-9021-e58139eae8a3" 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_019cb0a3-00e9-78fe-ab40-ab05617630af" xlink:to="loc_us-gaap_LaborForceConcentrationRiskMember_019cb0a3-00e9-785a-9021-e58139eae8a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019cb0a3-00e9-7b01-810e-87742553b4eb" 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_019cb0a3-00e9-7607-aeaf-a74a17545389" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019cb0a3-00e9-7b01-810e-87742553b4eb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cb0a3-00e9-7b01-810e-87742553b4eb_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_019cb0a3-00e9-7b01-810e-87742553b4eb" xlink:to="loc_us-gaap_SegmentDomain_019cb0a3-00e9-7b01-810e-87742553b4eb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cb0a3-00e9-7fed-8c31-22dbca5ca583" 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_019cb0a3-00e9-7b01-810e-87742553b4eb" xlink:to="loc_us-gaap_SegmentDomain_019cb0a3-00e9-7fed-8c31-22dbca5ca583" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ReportableSegmentMember_019cb0a3-00e9-78d4-a3b6-94293e3a3f5b" xlink:href="soun-20260331.xsd#soun_ReportableSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019cb0a3-00e9-7fed-8c31-22dbca5ca583" xlink:to="loc_soun_ReportableSegmentMember_019cb0a3-00e9-78d4-a3b6-94293e3a3f5b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_019cb0a3-00e9-77d7-bcec-12785349913e" 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_019cb0a3-00e9-7353-baf1-0fa3e3227dc4" xlink:to="loc_us-gaap_NumberOfReportableSegments_019cb0a3-00e9-77d7-bcec-12785349913e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_019cb0a3-00e9-7911-aa05-995570cb23ae" 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_019cb0a3-00e9-7353-baf1-0fa3e3227dc4" xlink:to="loc_us-gaap_LaborAndRelatedExpense_019cb0a3-00e9-7911-aa05-995570cb23ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019cb0a3-00e9-7ff7-93b4-6fa4f93da7a8" 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_019cb0a3-00e9-7353-baf1-0fa3e3227dc4" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019cb0a3-00e9-7ff7-93b4-6fa4f93da7a8" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/RELATEDPARTYTRANSACTIONSDetails" xlink:type="simple" xlink:href="soun-20260331.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_019cb0a3-00e9-78a9-b380-d30e79d07998" 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_019cb0a3-00e9-7dbd-be1c-d55d9ef2ac01" 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_019cb0a3-00e9-78a9-b380-d30e79d07998" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019cb0a3-00e9-7dbd-be1c-d55d9ef2ac01" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019cb0a3-00e9-7c6e-8f4f-1e83e0e4f5d3" 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_019cb0a3-00e9-7dbd-be1c-d55d9ef2ac01" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019cb0a3-00e9-7c6e-8f4f-1e83e0e4f5d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb0a3-00e9-7c6e-8f4f-1e83e0e4f5d3_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_019cb0a3-00e9-7c6e-8f4f-1e83e0e4f5d3" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb0a3-00e9-7c6e-8f4f-1e83e0e4f5d3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb0a3-00e9-7e37-ab9e-d0c117121e6f" 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_019cb0a3-00e9-7c6e-8f4f-1e83e0e4f5d3" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb0a3-00e9-7e37-ab9e-d0c117121e6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019cb0a3-00e9-7cb1-bd79-79407d5eedd6" 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_019cb0a3-00e9-7e37-ab9e-d0c117121e6f" xlink:to="loc_us-gaap_CommonClassAMember_019cb0a3-00e9-7cb1-bd79-79407d5eedd6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_019cb0a3-00e9-789a-bebf-e54f88cf4495" 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_019cb0a3-00e9-7dbd-be1c-d55d9ef2ac01" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_019cb0a3-00e9-789a-bebf-e54f88cf4495" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019cb0a3-00e9-789a-bebf-e54f88cf4495_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_019cb0a3-00e9-789a-bebf-e54f88cf4495" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019cb0a3-00e9-789a-bebf-e54f88cf4495_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019cb0a3-00e9-7c4d-aea9-bcb146b0c127" 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_019cb0a3-00e9-789a-bebf-e54f88cf4495" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019cb0a3-00e9-7c4d-aea9-bcb146b0c127" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SecondEquityDistributionAgreementMember_019cb0a3-00e9-74a0-9264-e16991576016" xlink:href="soun-20260331.xsd#soun_SecondEquityDistributionAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019cb0a3-00e9-7c4d-aea9-bcb146b0c127" xlink:to="loc_soun_SecondEquityDistributionAgreementMember_019cb0a3-00e9-74a0-9264-e16991576016" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ControlledEquityOfferingSalesAgreementMember_019cb0a3-00e9-7585-b435-fbe62fd771cb" xlink:href="soun-20260331.xsd#soun_ControlledEquityOfferingSalesAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019cb0a3-00e9-7c4d-aea9-bcb146b0c127" xlink:to="loc_soun_ControlledEquityOfferingSalesAgreementMember_019cb0a3-00e9-7585-b435-fbe62fd771cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019cb0a3-00e9-742a-8eb5-7c27641ec1dc" 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_019cb0a3-00e9-7dbd-be1c-d55d9ef2ac01" xlink:to="loc_srt_CounterpartyNameAxis_019cb0a3-00e9-742a-8eb5-7c27641ec1dc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019cb0a3-00e9-742a-8eb5-7c27641ec1dc_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_019cb0a3-00e9-742a-8eb5-7c27641ec1dc" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019cb0a3-00e9-742a-8eb5-7c27641ec1dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019cb0a3-00e9-7da5-98c9-99013354f8f5" 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_019cb0a3-00e9-742a-8eb5-7c27641ec1dc" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019cb0a3-00e9-7da5-98c9-99013354f8f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_GuggenheimSecuritiesLLCMember_019cb0a3-00e9-712c-ba61-ba67e91db3c1" xlink:href="soun-20260331.xsd#soun_GuggenheimSecuritiesLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019cb0a3-00e9-7da5-98c9-99013354f8f5" xlink:to="loc_soun_GuggenheimSecuritiesLLCMember_019cb0a3-00e9-712c-ba61-ba67e91db3c1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019cb0a3-00e9-7d00-9a9b-a147bd405140" 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_019cb0a3-00e9-7dbd-be1c-d55d9ef2ac01" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019cb0a3-00e9-7d00-9a9b-a147bd405140" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019cb0a3-00e9-7d00-9a9b-a147bd405140_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_019cb0a3-00e9-7d00-9a9b-a147bd405140" xlink:to="loc_us-gaap_RelatedPartyDomain_019cb0a3-00e9-7d00-9a9b-a147bd405140_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019cb0a3-00e9-7eb6-a7f2-dfd6c9aeae08" 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_019cb0a3-00e9-7d00-9a9b-a147bd405140" xlink:to="loc_us-gaap_RelatedPartyDomain_019cb0a3-00e9-7eb6-a7f2-dfd6c9aeae08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019cb0a3-00e9-737e-ad0b-8424b40ec541" 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_019cb0a3-00e9-7eb6-a7f2-dfd6c9aeae08" xlink:to="loc_us-gaap_RelatedPartyMember_019cb0a3-00e9-737e-ad0b-8424b40ec541" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SaleOfStockSharesOfStockAuthorizedToBeOfferedAndSold_019cb0a3-00e9-761e-812f-ece9f5016954" xlink:href="soun-20260331.xsd#soun_SaleOfStockSharesOfStockAuthorizedToBeOfferedAndSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019cb0a3-00e9-78a9-b380-d30e79d07998" xlink:to="loc_soun_SaleOfStockSharesOfStockAuthorizedToBeOfferedAndSold_019cb0a3-00e9-761e-812f-ece9f5016954" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForCommissions_019cb0a3-00e9-729b-b1f5-e6ab426a177d" 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_019cb0a3-00e9-78a9-b380-d30e79d07998" xlink:to="loc_us-gaap_PaymentsForCommissions_019cb0a3-00e9-729b-b1f5-e6ab426a177d" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.soundhound.com/role/SUBSEQUENTEVENTSDetails" xlink:type="simple" xlink:href="soun-20260331.xsd#SUBSEQUENTEVENTSDetails"/>
  <link:definitionLink xlink:role="http://www.soundhound.com/role/SUBSEQUENTEVENTSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_019cb0a3-00e9-7a49-96be-a7de1d46dd4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_019cb0a3-00e9-7a18-8ad3-60aa349103d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_019cb0a3-00e9-7a49-96be-a7de1d46dd4d" xlink:to="loc_us-gaap_SubsequentEventTable_019cb0a3-00e9-7a18-8ad3-60aa349103d0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019cb0a3-00e9-7bad-9f11-397c42d44ffd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019cb0a3-00e9-7a18-8ad3-60aa349103d0" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019cb0a3-00e9-7bad-9f11-397c42d44ffd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019cb0a3-00e9-7bad-9f11-397c42d44ffd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019cb0a3-00e9-7bad-9f11-397c42d44ffd" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019cb0a3-00e9-7bad-9f11-397c42d44ffd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019cb0a3-00e9-7146-9d26-9a14bca0b85d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019cb0a3-00e9-7bad-9f11-397c42d44ffd" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019cb0a3-00e9-7146-9d26-9a14bca0b85d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019cb0a3-00e9-7791-b502-822875e433ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019cb0a3-00e9-7146-9d26-9a14bca0b85d" xlink:to="loc_us-gaap_SubsequentEventMember_019cb0a3-00e9-7791-b502-822875e433ea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_019cb0a3-00e9-7cd7-9b55-7469b31629f4" 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_SubsequentEventTable_019cb0a3-00e9-7a18-8ad3-60aa349103d0" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_019cb0a3-00e9-7cd7-9b55-7469b31629f4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019cb0a3-00e9-7cd7-9b55-7469b31629f4_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_019cb0a3-00e9-7cd7-9b55-7469b31629f4" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019cb0a3-00e9-7cd7-9b55-7469b31629f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019cb0a3-00e9-7d04-9281-d832b92e13f4" 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_019cb0a3-00e9-7cd7-9b55-7469b31629f4" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019cb0a3-00e9-7d04-9281-d832b92e13f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SecondEquityDistributionAgreementMember_019cb0a3-00e9-7a4f-90fe-906f37b2f258" xlink:href="soun-20260331.xsd#soun_SecondEquityDistributionAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019cb0a3-00e9-7d04-9281-d832b92e13f4" xlink:to="loc_soun_SecondEquityDistributionAgreementMember_019cb0a3-00e9-7a4f-90fe-906f37b2f258" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_ThirdEquityDistributionAgreementMember_019e02b4-3f39-7b0e-909b-643de46c81e6" xlink:href="soun-20260331.xsd#soun_ThirdEquityDistributionAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019cb0a3-00e9-7d04-9281-d832b92e13f4" xlink:to="loc_soun_ThirdEquityDistributionAgreementMember_019e02b4-3f39-7b0e-909b-643de46c81e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e1721-c44f-78e8-ba03-e6d2b295582b" 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_SubsequentEventTable_019cb0a3-00e9-7a18-8ad3-60aa349103d0" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e1721-c44f-78e8-ba03-e6d2b295582b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e1721-c44f-78e8-ba03-e6d2b295582b_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_019e1721-c44f-78e8-ba03-e6d2b295582b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e1721-c44f-78e8-ba03-e6d2b295582b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e1721-eb18-74e3-9d67-90a3b6abd453" 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_019e1721-c44f-78e8-ba03-e6d2b295582b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e1721-eb18-74e3-9d67-90a3b6abd453" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_FirstLienConvertibleSecuredNotesMember_019e1722-e0c4-7155-a847-00003e8f2673" xlink:href="soun-20260331.xsd#soun_FirstLienConvertibleSecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e1721-eb18-74e3-9d67-90a3b6abd453" xlink:to="loc_soun_FirstLienConvertibleSecuredNotesMember_019e1722-e0c4-7155-a847-00003e8f2673" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SecondLienSenorSubordinatedSecuredNotesMember_019e1723-3cc1-7fae-b68b-5cf0e99dd883" xlink:href="soun-20260331.xsd#soun_SecondLienSenorSubordinatedSecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e1721-eb18-74e3-9d67-90a3b6abd453" xlink:to="loc_soun_SecondLienSenorSubordinatedSecuredNotesMember_019e1723-3cc1-7fae-b68b-5cf0e99dd883" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019df11b-e39f-715e-be18-1a329af69d7b" 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_SubsequentEventTable_019cb0a3-00e9-7a18-8ad3-60aa349103d0" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019df11b-e39f-715e-be18-1a329af69d7b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019df11b-e39f-715e-be18-1a329af69d7b_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_019df11b-e39f-715e-be18-1a329af69d7b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019df11b-e39f-715e-be18-1a329af69d7b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019df11b-e39f-76a5-8391-cf85d0e2844c" 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_019df11b-e39f-715e-be18-1a329af69d7b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019df11b-e39f-76a5-8391-cf85d0e2844c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_LivePersonIncMember_019df11b-e39f-7e37-9f6d-f09d8dbb75de" xlink:href="soun-20260331.xsd#soun_LivePersonIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019df11b-e39f-76a5-8391-cf85d0e2844c" xlink:to="loc_soun_LivePersonIncMember_019df11b-e39f-7e37-9f6d-f09d8dbb75de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019df110-aefd-7b49-8f33-b204eb5d639e" 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_SubsequentEventLineItems_019cb0a3-00e9-7a49-96be-a7de1d46dd4d" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019df110-aefd-7b49-8f33-b204eb5d639e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_019df111-3316-7c27-96b0-b74522ba0f5b" 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_SubsequentEventLineItems_019cb0a3-00e9-7a49-96be-a7de1d46dd4d" xlink:to="loc_us-gaap_SaleOfStockPricePerShare_019df111-3316-7c27-96b0-b74522ba0f5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019cb0a3-00e9-74bf-b89f-debc833a3abf" 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_SubsequentEventLineItems_019cb0a3-00e9-7a49-96be-a7de1d46dd4d" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_019cb0a3-00e9-74bf-b89f-debc833a3abf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfStockIssuanceCosts_019cb0a3-00e9-751a-a2a3-30522886dae8" 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_SubsequentEventLineItems_019cb0a3-00e9-7a49-96be-a7de1d46dd4d" xlink:to="loc_us-gaap_PaymentsOfStockIssuanceCosts_019cb0a3-00e9-751a-a2a3-30522886dae8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SaleOfStockRemainingCapacityToSell_019df113-0862-7001-ba25-e5e557aa30e7" xlink:href="soun-20260331.xsd#soun_SaleOfStockRemainingCapacityToSell"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019cb0a3-00e9-7a49-96be-a7de1d46dd4d" xlink:to="loc_soun_SaleOfStockRemainingCapacityToSell_019df113-0862-7001-ba25-e5e557aa30e7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_019df118-ee2f-780b-ba4c-24bbcd705406" 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_SubsequentEventLineItems_019cb0a3-00e9-7a49-96be-a7de1d46dd4d" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent_019df118-ee2f-780b-ba4c-24bbcd705406" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_019e02b0-a0f7-7346-91d9-0c3fbbcd4b34" 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_SubsequentEventLineItems_019cb0a3-00e9-7a49-96be-a7de1d46dd4d" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_019e02b0-a0f7-7346-91d9-0c3fbbcd4b34" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SaleOfStockConsiderationToBeReceivedOnTransaction_019e02b2-54ca-7d0e-ab27-352732675932" xlink:href="soun-20260331.xsd#soun_SaleOfStockConsiderationToBeReceivedOnTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019cb0a3-00e9-7a49-96be-a7de1d46dd4d" xlink:to="loc_soun_SaleOfStockConsiderationToBeReceivedOnTransaction_019e02b2-54ca-7d0e-ab27-352732675932" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_SaleOfStockCommissionRate_019e1725-1cb7-7baa-95cb-c0c7b0f7f1b4" xlink:href="soun-20260331.xsd#soun_SaleOfStockCommissionRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019cb0a3-00e9-7a49-96be-a7de1d46dd4d" xlink:to="loc_soun_SaleOfStockCommissionRate_019e1725-1cb7-7baa-95cb-c0c7b0f7f1b4" xlink:type="arc" order="8"/>
  </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_019cb0a2-fd7d-758c-8878-98254a4e3990" xlink:href="soun-20260331.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_019cb0a2-fd7d-758c-8878-98254a4e3990" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_JamesM.HomMember_019cb0a2-fd7d-7330-b8fb-e86d38ede6dd" xlink:href="soun-20260331.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_019cb0a2-fd7d-7330-b8fb-e86d38ede6dd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MajidEmamiMember_019cb0a2-fd7d-7b21-952a-16c25f2aaf31" xlink:href="soun-20260331.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_019cb0a2-fd7d-7b21-952a-16c25f2aaf31" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MichaelZagorsekMember_019cb0a3-00ea-7b4d-b913-91348267837f" xlink:href="soun-20260331.xsd#soun_MichaelZagorsekMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_soun_MichaelZagorsekMember_019cb0a3-00ea-7b4d-b913-91348267837f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_EricBallMember_019db3d8-fc57-7f6c-8a1a-9961a8080cd6" xlink:href="soun-20260331.xsd#soun_EricBallMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecd_AllIndividualsMember" xlink:to="loc_soun_EricBallMember_019db3d8-fc57-7f6c-8a1a-9961a8080cd6" xlink:type="arc" order="6"/>
  </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_019cb0a2-fd7d-7d0a-bf00-46f0b17889b0" xlink:href="soun-20260331.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_019cb0a2-fd7d-7d0a-bf00-46f0b17889b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_Dr.KeyvanMohajerClassACommonStockUponVestingAndSettlementOfRSUsAndPSUsTradingArrangementMember_019cb0a2-fd7d-713a-847b-cad556ef9305" xlink:href="soun-20260331.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_019cb0a2-fd7d-713a-847b-cad556ef9305" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_JamesM.HomMay2025TradingArrangementMember_019cb0a2-fe3d-7e6c-80a0-d64b7503de38" xlink:href="soun-20260331.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_019cb0a2-fe3d-7e6c-80a0-d64b7503de38" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_JamesM.HomClassBCommonStockTradingArrangementMay2025Member_019cb0a2-fedb-779d-8df6-1d70e66e9bbc" xlink:href="soun-20260331.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_019cb0a2-fedb-779d-8df6-1d70e66e9bbc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_JamesM.HomTradingArrangementClassACommonStockUponVestingAndSettlementOfRSUsMay2025Member_019cb0a2-fd7d-7f9a-bd76-edf3d86f84e8" xlink:href="soun-20260331.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_019cb0a2-fd7d-7f9a-bd76-edf3d86f84e8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MajidEmamiClassBCommonStockTradingArrangementMember_019cb0a2-fe3d-7271-b37d-9dfab373b95a" xlink:href="soun-20260331.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_019cb0a2-fe3d-7271-b37d-9dfab373b95a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_soun_MajidEmamiClassACommonStockUponVestingAndSettlementOfRSUsAndPSUsTradingArrangementMember_019cb0a2-fe3d-782c-9dc6-dc72bed7b4b0" xlink:href="soun-20260331.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_019cb0a2-fe3d-782c-9dc6-dc72bed7b4b0" xlink:type="arc" order="7"/>
  </link:definitionLink>
</link:linkbase>
