- 1invalidate something to prove that an idea, a story, an argument, etc. is wrong This new piece of evidence invalidates his version of events.
- 2invalidate something if you invalidate a document, contract, election, etc., you make it no longer legally or officially valid or acceptable opposite validate
verbjump to other results
NAmE//ɪnˈvæləˌdeɪt//Verb Forms present simple I / you / we / they invalidate
he / she / it invalidates
past simple invalidated
-ing form invalidating
invalidationjump to other results