invalid adjective definition, meaning - what is invalid adjective in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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English definition of “invalid”

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invalid

adjective uk   us   /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. An invalid opinion, argument, etc. is not correct, usually because it is not logical or not based on correct information: an invalid argument
invalidly
adverb uk   us   /-li/
(Definition of invalid adjective from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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