affirming 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 affirmed, as “All men are happy.”
something that affirms or asserts; a positive statement or proposition; affirmation.
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 affirms 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.”

1400–50; < Latin affirmātīvus, equivalent to affirmāt- (see affirmation) + -īvus -ive; replacing late Middle English affirmatyff < Middle French < Latin

affirmatively, adverb
overaffirmative, adjective
overaffirmatively, adverb
preaffirmative, adjective
quasi-affirmative, adjective
quasi-affirmatively, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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World English Dictionary
affirmative (əˈfɜːmətɪv)
1.  confirming or asserting something as true or valid: an affirmative statement
2.  indicating agreement or assent: an affirmative answer
3.  logic
 a.  (of a categorial proposition) affirming the satisfaction by the subject of the predicate, as in all birds have feathers; some men are married
 b.  Compare negative not containing negation
4.  a positive assertion
5.  a word or phrase stating agreement or assent, such as yes (esp in the phrase answer in the affirmative)
6.  logic an affirmative proposition
7.  chiefly (US), (Canadian) the affirmative the side in a debate that supports the proposition
sentence substitute
8.  military a signal codeword used to express assent or confirmation

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1500, from Fr. affirmatif (13c.), from L. affirmativus, from pp. stem of affirmare (see affirm). Meaning "answering yes" is from c.1400, from use in logic. Affirmative action "positive effort by employers to prevent discrimination in hiring or promotion" is attested from
1935 with regard to labor practices; specific racial sense is from 1961; now often used more generally in ref. to hiring quotas, etc.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Federal Government have taken affirmative steps to insure equal opportunity for
  all employees and applicants for employment.
Greensboro College is an affirmative action, equal opportunity employer.
Others in compliance with the state law may use affirmative defense.
He analyzes these questions and outlines a variety of potential projects
  attendant on affirmative answers.
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