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negation

[ni-gey-shuh n] /nɪˈgeɪ ʃən/
noun
1.
the act of denying:
He shook his head in negation of the charge.
2.
a denial:
a negation of one's former beliefs.
3.
something that is without existence; nonentity.
4.
the absence or opposite of something that is actual, positive, or affirmative:
Darkness is the negation of light.
5.
a negative statement, idea, concept, doctrine, etc.; a contradiction, refutation, or rebuttal:
a shameless lie that demands a negation.
Origin
late Middle English
1375-1425
1375-1425; late Middle English < Latin negātiōn- (stem of negātiō) denial. See negate, -ion
Related forms
negational, adjective
negationist, noun
nonnegation, noun
renegation, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for negationist

negation

/nɪˈɡeɪʃən/
noun
1.
the opposite or absence of something
2.
a negative thing or condition
3.
the act or an instance of negating
4.
(logic)
  1. the operator that forms one sentence from another and corresponds to the English not
  2. 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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for negationist

negation

n.

early 15c., from Old French negacion (12c.) and directly from Latin negationem (nominative negatio) "denial," noun of action from past participle stem of negare "deny, say no" (see deny).

Online Etymology Dictionary, © 2010 Douglas Harper
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negationist in Medicine

negation ne·ga·tion (nĭ-gā'shən)
n.
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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