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
Such actions, if carried out extensively, might well nullify the law.
Be prepared to nullify or overturn the results.
How do you nullify the few bad apples who consistently bring your average down.
The majority of these are passive and therefore nullify your point.
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