- 1invalidate something to prove that an idea, a story, an argument, etc. is wrong This new piece of evidence invalidates his version of events.
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- 2invalidate something if you invalidate a document, contract, election, etc., you make it no longer legally or officially valid or acceptable opposite validate
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NAmE//ɪnˈvæləˌdeɪt//
Verb Forms present simple I / you / we / they invalidate he / she / it invalidates
past simple invalidated
-ing form invalidating
NAmE//ɪnˌvæləˈdeɪʃn//
noun [uncountable]See invalidate in the Oxford Advanced Learner's DictionaryCheck pronunciation: invalidate