English

Definition of invalidate verb from the Oxford Advanced Learner's Dictionary

      

    invalidate

     verb
    verb
    BrE BrE//ɪnˈvælɪdeɪt//
     
    ; NAmE NAmE//ɪnˈvælɪdeɪt//
     
    Verb Forms present simple I / you / we / they invalidate
    BrE BrE//ɪnˈvælɪdeɪt//
     
    ; NAmE NAmE//ɪnˈvælɪdeɪt//
     
    he / she / it invalidates
    BrE BrE//ɪnˈvælɪdeɪts//
     
    ; NAmE NAmE//ɪnˈvælɪdeɪts//
     
    past simple invalidated
    BrE BrE//ɪnˈvælɪdeɪtɪd//
     
    ; NAmE NAmE//ɪnˈvælɪdeɪtɪd//
     
    past participle invalidated
    BrE BrE//ɪnˈvælɪdeɪtɪd//
     
    ; NAmE NAmE//ɪnˈvælɪdeɪtɪd//
     
    -ing form invalidating
    BrE BrE//ɪnˈvælɪdeɪtɪŋ//
     
    ; NAmE NAmE//ɪnˈvælɪdeɪtɪŋ//
     
     
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  1. 1invalidate something to prove that an idea, a story, an argument, etc. is wrong This new piece of evidence invalidates his version of events. Flawed research methods may invalidate the study’s conclusions.
  2. 2invalidate something if you invalidate a document, a contract, an election, etc., you make it no longer legally or officially valid or acceptable Misuse of the mattress will invalidate the guarantee opposite validate
  3. Word Origin mid 17th cent.: from medieval Latin invalidat- ‘annulled’, from the verb invalidare (based on Latin validus ‘strong’).
See the Oxford Advanced American Dictionary entry: invalidate