the act or an instance of affirming; state of being affirmed.
the assertion that something exists or is true.
something that is affirmed; a statement or proposition that is declared to be true.
confirmation or ratification of the truth or validity of a prior judgment, decision, etc.
Law. a solemn declaration accepted instead of a statement under oath.

1535–45; < Latin affirmātiōn- (stem of affirmātiō), equivalent to affirmāt(us) (past participle of affirmāre to affirm) + -iōn- -ion

nonaffirmation, noun
overaffirmation, noun
preaffirmation, noun
reaffirmation, noun
self-affirmation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
affirmation (ˌæfəˈmeɪʃən)
1.  the act of affirming or the state of being affirmed
2.  a statement of the existence or truth of something; assertion
3.  law a solemn declaration permitted on grounds of conscientious objection to taking an oath

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1530s, from Fr. affirmation (14c.), from L. affirmationem (nom. affirmatio), noun of action from affirmare (see affirm). In law, as the Quaker alternative to oath-taking, it is attested from 1690s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


in law, a promise by a witness concerning testimony allowed in place of an oath to those who cannot, because of conscience, swear an oath. For example, members of the Society of Friends (Quakers), Jehovah's Witnesses, and other persons who have objections against taking an oath are allowed to make affirmation in any manner they may declare to be binding upon their consciences in confirmation of the truth of their testimony.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
He is a natural showman, and he thrives on affirmation.
This is a fascinating affirmation of the existence of the human soul and a
  difficult read, but well worth the effort.
Instead it's a calm, reflective affirmation of family love.
Increasingly, these kids turn to brand names for security and affirmation.
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