To state or assert positively; tell with confidence; aver; declare to be a fact; maintain as true: opposed to deny.To make firm; establish, confirm, or ratify: as, the appellate court affirmed the judgment.To declare or assert positively or solemnly.To declare solemnly before a court or magistrate, but without oath (a practice allowed where the affirmant has scruples against taking an oath); make a legal affirmation. See affirmation.