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English definition of “invalidate”

invalidate

verb [T]     /ɪnˈvæl.ɪ.deɪt/
to officially stop a document, ticket, law, etc. being legally or officially acceptableProving and disproving to prove that an opinion, argument, etc. is wrongProving and disproving invalidation     /ɪnˌvæl.ɪˈdeɪ.ʃən/ noun [U] Premature disclosure of the test sites might lead to invalidation of the experiment.Proving and disproving
(Definition of invalidate verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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