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English definition of “invalidate”

invalidate

verb [T] uk   /ɪnˈvæl.ɪ.deɪt/ us  
to officially stop a document, ticket, law, etc. being legally or officially acceptable to prove that an opinion, argument, etc. is wrong
invalidation
noun [U] uk   /ɪnˌvæl.ɪˈdeɪ.ʃən/ us  
Premature disclosure of the test sites might lead to invalidation of the experiment.
(Definition of invalidate from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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