verb (used without object)
to cease to be seen; vanish from sight.
to cease to exist or be known; pass away; end gradually: One by one the symptoms disappeared.
(of a person) to vanish under suspicious circumstances: The dictator's outspoken opponent disappeared that evening, shortly after midnight.
verb (used with object)
to cause to disappear: The magician then disappeared the card.
to kidnap or arrest and then imprison or kill (a political opponent) without due process of law.
noun (used with a plural verb)
the disappeared, political opponents who are caused to disappear, as by kidnapping: the disappeared of Argentina.

1520–30; dis-1 + appear

nondisappearing, adjective
undisappearing, adjective

1. Disappear, fade, vanish suggest that something passes from sight. Disappear is used of whatever suddenly or gradually goes out of sight: We watched him turn down a side street and then disappear. Fade suggests a (complete or partial) disappearance that proceeds gradually and often by means of a blending into something else: Colors in the sky at sunrise quickly fade. Vanish suggests complete, generally rapid, and often mysterious disappearance: A mirage can vanish as suddenly as it appears.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
disappear (ˌdɪsəˈpɪə)
1.  (intr) to cease to be visible; vanish
2.  (intr) to go away or become lost, esp secretly or without explanation
3.  (intr) to cease to exist, have effect, or be known; become extinct or lost: the pain has disappeared
4.  (tr) (esp in South and Central America) to arrest secretly and presumably imprison or kill (a member of an opposing political group)

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

1520s, from dis- "do the opposite of" (see dis-) + appear. Related: Disappeared; disappearing; disappears. Slang disappearing act is originally of magic shows; in figurative sense of "getting away" first attested 1913.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Specialties will vanish, teaching positions will shift and disappear.
But without insects and microbes, humans would disappear quickly.
Lounsbury may have other ways of making his problems disappear.
Nor do the liabilities disappear if the pension scheme fails to achieve its
  targeted returns.
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