invalid Meaning in the Cambridge English Dictionary
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Meaning of “invalid” in the English Dictionary

"invalid" in British English

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invalidadjective

uk   us   /ɪnˈvæl.ɪd/
An invalid ​document, ​ticket, ​law, etc. is not ​legally or ​officiallyacceptable: I'm ​afraidyourdrivinglicence is invalid in ​EasternEurope. An invalid ​opinion, ​argument, etc. is not ​correct, usually because it is not logical or not ​based on ​correctinformation: an invalid ​argument
invalidly
adverb uk   us   /-li/

invalidnoun [C]

uk   us   /ˈɪn.və.lɪd/ old-fashioned
someone who is ​sick and ​unable to take ​care of himself or herself, ​especially for a ​longtime: Is the invalid in ​bed?
(Definition of invalid from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"invalid" in American English

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invalidadjective [not gradable]

 us   /ɪnˈvæl·ɪd/
not ​true or ​acceptable, or not ​correctlythought out: The ​results of the ​election were ​declared invalid by the ​court.

invalidnoun [C]

 us   /ˈɪn·və·lɪd/
a ​person who is ​ill or ​injured for a ​longtime and usually has to be ​cared for by ​others: My dad’s ​mother is an invalid, and she ​lives with my ​aunt and ​uncle.
(Definition of invalid from the Cambridge Academic Content Dictionary © Cambridge University Press)

"invalid" in Business English

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invalidadjective

uk   us   /ɪnˈvælɪd/
LAW not ​legally or ​officially acceptable: an invalid ​document/​passport/​licencebe declared/deemed/ruled invalid Insurance is ​ruled invalid if the ​report is not received within 30 days of the ​theft.
not ​correct, or not ​based on ​correctinformation: A ​smallnumber of ​messagesbounced back from invalid ​e-mailaccounts.
IT not ​recognized or ​accepted by a ​computer: invalid ​data
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(Definition of invalid from the Cambridge Business English Dictionary © Cambridge University Press)
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