confirm

(verb) establish or strengthen as with new evidence or facts. Synonyms: corroborate, sustain, substantiate, support, affirm. Examples: "His story confirmed my doubts." "The evidence supports the defendant."

(verb) strengthen or make more firm. Synonyms: reassert. Example: "The witnesses confirmed the victim's account."

(verb) make more firm. Example: "Confirm thy soul in self-control!."

(verb) support a person for a position. Example: "The senate confirmed the president's candidate for secretary of defense."

(verb) administer the rite of confirmation to. Example: "The children were confirmed in their mother's faith."