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English definition of “invalid”

invalid

adjective     /ɪnˈvæl.ɪd/
An invalid document, ticket, law, etc. is not legally or officially acceptable: I'm afraid your driving licence is invalid in Eastern Europe.Wrong An invalid opinion, argument, etc. is not correct, usually because it is not logical or not based on correct information: an invalid argumentWrong invalidly     /-li/ adverb Wrong
(Definition of invalid adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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