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English definition of “invalid”

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invalid

adjective
 
 
/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 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)
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