[ig-nawr, -nohr]
verb (used with object), ignored, ignoring.
to refrain from noticing or recognizing: to ignore insulting remarks.
Law. (of a grand jury) to reject (a bill of indictment), as on the grounds of insufficient evidence.

1605–15; < Latin ignōrāre to not know, disregard, verbal derivative of ignārus ignorant, unaware (with -ō- perhaps from ignōtus unknown), equivalent to in- in-3 + gnārus knowing, acquainted (with); akin to (g)nōscere to know1

ignorable, adjective
ignorer, noun
unignorable, adjective
unignorably, adverb
unignored, adjective
unignoring, adjective
well-ignored, adjective

1. overlook; slight, disregard, neglect.

1. notice, regard.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ignore (ɪɡˈnɔː)
1.  to fail or refuse to notice; disregard
2.  informal (Austral) disregard: to treat someone with ignore
[C17: from Latin ignōrāre not to know, from ignārus ignorant of, from i-in-1 + gnārus knowing; related to Latin noscere to know]

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

1611, "not to know, to be ignorant of," from Fr. ignorer, from L. ignorare "not to know, disregard," from ignarus "not knowing, unaware" (see ignorant). Sense of "pay no attention to" first recorded 1801 and not common until c.1850.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The stuff that people used to watch or listen to largely because there was
  little else on is increasingly being ignored.
Researchers had ignored such behavior because it seemed unimportant--rats being
In his early career, he ignored cats entirely, focusing instead on insects.
In doing so, board members ignored pleas from college history professors and
  other experts that the vote be delayed.
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