verb (used with object), nullified, nullifying.
to render or declare legally void or inoperative: to nullify a contract.
to deprive (something) of value or effectiveness; make futile or of no consequence.

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

nullifier, noun
renullify, verb (used with object), renullified, renullifying.
unnullified, adjective

1, 2. invalidate, annul, void, cancel. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nullify (ˈnʌlɪˌfaɪ)
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]

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

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
Biodiversity nullified the impacts of species specific degradation of the
  liveable environment.
Night is a time when human beings' main survival sense-vision-is weakened or
It completely nullified the effects of alcohol on the central nervous system.
Perry's defense did little good, and the legislature nullified the order.
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