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Definition of affirm : 1. to assert or confirm, as a judgment, decree, or order, brought before an appellate court for review.
2. To assert positively; to tell with confidence; to aver; to maintain as true; - opposed to deny.
3. To declare or assert positively.
4. To declare, as a fact, solemnly, under judicial sanction. See Affirmation, 4.
5. To make a solemn declaration, before an authorized magistrate or tribunal, under the penalties of perjury; to testify by affirmation.

Synonyms:

keep going, offer, agree with, assign, rely, introduce, repeat, incarnate, point to, actualize, prolong, bear, hold up, cite, plead, stomach, put up, show, plump for, advance, pass, adopt, brook, recognize, stick out, bring before, cuss, adduce, reassert, stand, condone, patronise, curse, imprecate, purport, accredit, ramble, rove, cast, produce, tramp, lay down, argue, realise, asseverate, stray, digest, prove, roam, drift, tolerate, defend, sympathize, swan, back up, promote, realize, range, embody, nourish, align, allege, OK, subscribe, vagabond, patronage, put forward, depose, depone, call, look kindly on something, arraign, say, blaspheme, have, suffer, plunk for, patronize, keep up, bank, wander, get, ally, protest, actualise, appear, give something/someone the green light, body forth, speak up for, law, get behind, keep, endure, back, abide, underpin, nurture, vouch for, insist, substantiate, appeal, bring, roll, control, swear, indorse, make/prove your/a point, avow, recommend, allow, bear out, fend for, study atassert

bless, contract, empathize, acquiesce, conform, welcome, pledge, agree, accept, cooperate, stipulate, approve, capitulate, accede, assent, promise, endorse, sanction, consent, concur

authorize, authenticate, confirm, permit, underwrite, approbate

assure, express, declare, proclaim, contend, submit, certify, profess, maintain, ratify, sustain, avouch, verify, state, acknowledge, propound, attest, warrant, set down, aver, assert, adjure, support, testify, pronounce, validate, claim, admit, corroborate

designate, notarize, commission, empower, enable, denominate, ordain, deputize, license, enfranchise, entitle, countersign

guarantee, insure, ensure, bond, safeguard, vouch, secure

believe, surmise, gather, take for granted, understand, assume, conclude, presume, suppose, trust, judge, give faith, put faith in, credit, deem, hold

Usage examples:

• While he lived she could affirm the rights of a white man's daughter, the rights of the daughter of a pioneer who had helped to make the West; and her pride in him had given a glow to her cheek and a spring to her step which drew every eye. - "Northern Lights", Gilbert Parker.
• That is a separate matter; in which, doubtless, there would be plenty to affirm on the one hand that the prices charged were no more than a just compensation, while their opponents would declare that the prices adopted by the pool favor some points to the prejudice of others, and that the statement that they were on the whole exorbitant was proven by the fact that the railway lines in the coal regions, where honestly managed, have paid great dividends on the actual capital invested. - "Monopolies and the People", Charles Whiting Baker.
• We should have instantly observed and removed any male that appeared, that the result of the experiment might be undisturbed, and I can positively affirm that not one was seen. - "New observations on the natural history of bees", Francis Huber.