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English definition of “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 argument Wrong invalidly     /-li/ adverb Wrong
(Definition of invalid adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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