confirm

verb

1. establish or strengthen as with new evidence or facts"his story confirmed my doubts"
2. strengthen or make more firm"The witnesses confirmed the victim's account"
3. make more firm"Confirm thy soul in self-control!"
4. support a person for a position"The Senate confirmed the President's candidate for Secretary of Defense"
5. administer the rite of confirmation to"the children were confirmed in their mother's faith"