Definition of invalidate verb from the Oxford Advanced American Dictionary

      

    invalidate

     verb
    verb
    NAmE//ɪnˈvæləˌdeɪt//
     
    Verb Forms present simple I / you / we / they invalidate
     
    he / she / it invalidates
     
    past simple invalidated
     
    -ing form invalidating
     
     
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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.
  2. 2invalidate something if you invalidate a document, contract, election, etc., you make it no longer legally or officially valid or acceptable opposite validate
invalidation
 
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NAmE//ɪnˌvæləˈdeɪʃn//
 
noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: invalidate