confirmcon·firm /kənˈfɜːm-fɜːrm/ verb [transitiveT]1to say or show that something is definitely trueThe company said the report confirmed what its own directors and accountants had already established.
confirm thatWalsh confirmed that the money had been paid.
2to tell someone that a possible arrangement, date, or time is now definiteCould you confirm the dates we discussed?
I am writing to confirm our order for a 500mm print.
If a confirmed booking is cancelled a 50% fee will be charged.
—confirmation noun [uncountableU]The bank has to receive confirmation that the check has cleared.