See affirm in Webster's New World Roget's A-Z Thesaurus II
verb
To put into words positively and with conviction:
allege, argue, assert, asseverate, aver, avouch, avow, claim, contend, declare, hold, maintain, say, state. Idiom: have it. See affirmTo accept officially:
adopt, approve, confirm, pass, ratify, sanction. See accept, law
Learn more about affirm