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English definition of “confirm”

confirm

verb [I or T] (MAKE CERTAIN)    /kənˈfɜːm/ US  /-ˈfɝːm/
B1 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 .Planning, expecting and arrangingPlotting and trapping
(Definition of confirm verb (MAKE CERTAIN) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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