vt to strengthen in judgment or purpose.
2. confirm ·vt to administer the rite of confirmation to. ·see confirmation, 3.
3. confirm ·vt to make firm or firmer; to add strength to; to establish; as, health is confirmed by exercise.
4. confirm ·vt to give new assurance of the truth of; to render certain; to verify; to corroborate; as, to confirm a rumor.
5. confirm ·vt 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.