confirm Definition in Cambridge British English Dictionary
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Definition of "confirm" - British English Dictionary

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confirmverb

uk   /kənˈfɜːm/  us   /-ˈfɝːm/

confirm verb (MAKE CERTAIN)

B1 [I or T] to make an arrangement or meeting certain, often by phone or writing: [+ that] Six people have confirmed that they will be attending and ten haven't replied yet. Flights should be confirmed 48 hours before departure. I've accepted the job over the phone, but I haven't confirmed in writing yet.
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confirm verb (PROVE TRUE)

B2 [T] to prove that a belief or an opinion that was previously not completely certain is true: [+ question word] The smell of cigarette smoke confirmed what he had suspected: there had been a party in his absence. [+ (that)] Her announcement confirmed (that) she would be resigning as prime minister. The leader's speech was impressive and confirmed her faith in the party.
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confirm verb (RELIGION)

[T] to accept someone formally as a full member of the Christian Church at a special ceremony
(Definition of confirm from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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