Confirm

v. t.
  1. To make firm or firmer; to add strength to; to establish; as, health is confirmed by exercise.
  2. To strengthen in judgment or purpose.
  3. To give new assurance of the truth of; to render certain; to verify; to corroborate; as, to confirm a rumor.
  4. To render valid by formal assent; to complete by a necessary sanction; to ratify; as, to confirm the appoinment of an official; the Senate confirms a treaty.
  5. (Eccl.) To administer the rite of confirmation to. See Confirmation, 3.