Meaning of “invalid” in the English Dictionary

"invalid" in British English

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invalidadjective

uk /ɪnˈvæl.ɪd/ us /ɪnˈvæl.ɪd/

invalidnoun [ C ]

uk /ˈɪn.və.lɪd/ us /ˈɪn.və.lɪd/ old-fashioned

(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 correctly thought 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 long time 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 /ɪnˈvælɪd/ us

LAW not legally or officially acceptable:

be 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 correct information:

A small number of messages bounced back from invalid e-mail accounts.

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)