nul·li·fy

[nuhl-uh-fahy]
verb (used with object), nul·li·fied, nul·li·fy·ing.
1.
to render or declare legally void or inoperative: to nullify a contract.
2.
to deprive (something) of value or effectiveness; make futile or of no consequence.

Origin:
1585–95; < Late Latin nūllificāre to despise. See nulli-, -fy

nul·li·fi·er, noun
re·nul·li·fy, verb (used with object), re·nul·li·fied, re·nul·li·fy·ing.
un·nul·li·fied, adjective


1, 2. invalidate, annul, void, cancel.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Nullify is a GRE word you need to know.
So is taciturn. Does it mean:
inclined to silence; reserved in speech; reluctant to join in conversation.
a person who changes to the opposite party or faction, reverses principles, etc.; renegade.
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World English Dictionary
nullify (ˈnʌlɪˌfaɪ) [Click for IPA pronunciation guide]
 
vb , -fies, -fying, -fied
1.  to render legally void or of no effect
2.  to render ineffective or useless; cancel out
 
[C16: from Late Latin nullificāre to despise, from Latin nullus of no account + facere to make]
 
nullifi'cation
 
n
 
'nullifier
 
n

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

nullify
1595, from L.L. nullificare "to esteem lightly, despise, to make nothing," from L. nullus "not any" (see null) + root of facere "to make" (see factitious). Nullification in U.S. political sense of "a state's refusing to allow a federal law to
be enforced" is first attested 1798, in Thomas Jefferson, from L.L. nullificationem (nom. nullificatio) "a making as nothing."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It'll come down to sheer aggression and luck, which will nullify skill.
It wasn't enough for us to nullify disabling conditions and get to zero.
The simple fact that both express a similar opinion does not in any way nullify
  these differences in consequence.
The majority of these are passive and therefore nullify your point.
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