affirm Definition

affirm
verb affirmed, affirming

1. To state something positively and firmly; to state something as a fact.

Thesaurus: confirm, assert, attest, maintain, corroborate, certify, state, declare, pronounce, swear, testify, witness, depose.
2. To uphold or confirm (an idea, belief, etc).
intr
3. In a court of law: to promise solemnly to tell the truth, as opposed to swearing a religious oath.

Derivative: affirmation
noun

Etymology: 14c: from French afermer, from Latin firmare to make firm.