Definition of "Confirm" :

verb: make more firm

"Confirm thy soul in self-control!."

verb: establish or strengthen as with new evidence or facts

"His story confirmed my doubts."

verb: strengthen or make more firm

"The witnesses confirmed the victim's account."

verb: administer the rite of confirmation to

"The children were confirmed in their mother's faith."

verb: support a person for a position

"The Senate confirmed the President's candidate for Secretary of Defense."