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or assenting; asserting the truth, validity, or fact of something.
expressing agreement or consent; assenting:
an affirmative reply.
positive; not negative.
Logic. noting a proposition in which a property of a subject is , as “All men are happy.”.
something that or asserts; a positive statement or proposition; .
a reply indicating assent, as Yes or I do.
a manner or mode that indicates assent:
a reply in the affirmative.
the side, as in a debate, that or defends a statement that the opposite side denies or attacks:
to speak for the affirmative.
(used to indicate agreement, assent, etc.): “Is this the right way to Lake George?” “Affirmative.”.
Contemporary Examples

With these new apps, users will have to affirmatively click a consent box that gives the app permission to share information.
Facebook’s New Grab for More Data Justin Brookman September 21, 2011

Historical Examples

He added, rather interrogatively than affirmatively, “In the right spirit.”
The Minister’s Charge William Dean Howells

So much is shown, affirmatively and negatively, by the election.
The Papers And Writings Of Abraham Lincoln, Volume Seven Abraham Lincoln

May be predicated in like manner (affirmatively or negatively) of the latter term (or part of it).
Logic Carveth Read

These were questions which occurred to everyone, and many answered them affirmatively.
The River War Winston S. Churchill

My own mind was fully made up on that point, and affirmatively so.
Parasites T. Spencer Cobbold

If affirmatively, George supposes again that there’s an end of it.
Ginger-Snaps Fanny Fern

After the fashion of the British Diplomatic Service, he expressed his opinion most affirmatively.
“And they thought we wouldn’t fight” Floyd Gibbons

Yet she had said it, and women do not lie (affirmatively) about such a matter.
Joan of the Sword Hand S(amuel) R(utherford) Crockett

Noll bobbed timidly when compliments were paid him, and gratefully and affirmatively when in his presence he heard others praised.
Oliver Goldsmith E. S. Lang Buckland

adjective
confirming or asserting something as true or valid: an affirmative statement
indicating agreement or assent: an affirmative answer
(logic)

(of a categorial proposition) affirming the satisfaction by the subject of the predicate, as in all birds have feathers; some men are married
not containing negation Compare negative (sense 12)

noun
a positive assertion
a word or phrase stating agreement or assent, such as yes (esp in the phrase answer in the affirmative)
(logic) an affirmative proposition
(mainly US & Canadian) the affirmative, the side in a debate that supports the proposition
sentence substitute
(military) a signal codeword used to express assent or confirmation
adv.

mid-15c., from affirmative + -ly (2).
adj.

“answering ‘yes,'” mid-15c., from use in logic; from Middle French affirmatif (13c.), from Latin affirmativus, from affirmat-, past participle stem of affirmare (see affirm). As a noun from early 15c. Affirmative action “positive or corrective effort by employers to prevent discrimination in hiring or promotion” is attested from 1935 with regard to labor unions; specific racial sense is from 1961; now often used more generally in reference to hiring quotas, etc.