confirm
vb tr
1 may take a clause as object to prove to be true or valid; corroborate; verify
2 may take a clause as object to assert for a second or further time, so as to make more definite
he confirmed that he would appear in court
3 to strengthen or make more firm
his story confirmed my doubts
4 to make valid by a formal act or agreement; ratify
5 to administer the rite of confirmation to
(C13: from Old French confermer, from Latin confirmare, from firmus firm1)
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confirmable adj
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confirmatory, confirmative adj
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confirmer n