[ni-geyt, neg-eyt]
verb (used with object), negated, negating.
to deny the existence, evidence, or truth of: an investigation tending to negate any supernatural influences.
to nullify or cause to be ineffective: Progress on the study has been negated by the lack of funds.
verb (used without object), negated, negating.
to be negative; bring or cause negative results: a pessimism that always negates.

1615–25; < Latin negātus (past participle of negāre to deny, refuse), equivalent to neg- (variant of nec not; see neglect) + -ā- theme vowel + -tus past participle suffix

negator, negater, noun
renegate, verb (used with object), renegated, renegating.
self-negating, adjective
unnegated, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
negate (nɪˈɡeɪt)
1.  to make ineffective or void; nullify; invalidate
2.  to deny or contradict
[C17: from Latin negāre, from neg-, variant of nec not + aio I say]

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

1837, back formation from negation. Related: Negated; negates; negating.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Working at negating instincts is working against nature.
And, you know, formulating crazy hypotheses and testing them and negating them.
Or an advanced physics experiment goes haywire, negating space-time in a
  runaway chain reaction.
Many of these are also available in app form, negating the need to download a
  bunch of songs onto your mobile device.
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