the act of denying: He shook his head in negation of the charge.
a denial: a negation of one's former beliefs.
something that is without existence; nonentity.
the absence or opposite of something that is actual, positive, or affirmative: Darkness is the negation of light.
a negative statement, idea, concept, doctrine, etc.; a contradiction, refutation, or rebuttal: a shameless lie that demands a negation.

1375–1425; late Middle English < Latin negātiōn- (stem of negātiō) denial. See negate, -ion

negational, adjective
negationist, noun
nonnegation, noun
renegation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
negation (nɪˈɡeɪʃən)
1.  the opposite or absence of something
2.  a negative thing or condition
3.  the act or an instance of negating
4.  logic
 a.  the operator that forms one sentence from another and corresponds to the English not
 b.  a sentence so formed. It is usually written --p, ~p, ̄p or ⇁p, where p is the given sentence, and is false when the given sentence is true, and true when it is false

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

1520s, from M.Fr. negation, from L. negationem (nom. negatio) "denial," from negatus, pp. of negare "deny, say no" (see deny).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

negation ne·ga·tion (nĭ-gā'shən)
A denial, contradiction, or negative statement.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
On lazy afternoons, you lectured to hung-over sophomores about the negation of the negation.
What does sound cold-blooded, however, is the dismissal and outright negation of the emotional impact of difficult life decisions.
Part of this would be a negation of the framework for the current negotiations.
And then there was his inability to comprehend the despair and self-negation he inflicted on others.
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