the act or an instance of disappearing; a ceasing to be seen or to exist.

1705–15; disappear + -ance

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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
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Word Origin & History

1712; from disappear + -ance.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Their vanishing touches us as the disappearance of other animals, even the
  dinosaurs, never can.
The bald eagles' disappearance, scientists speculate, left an opening for the
  golden eagles.
To the mystery of the objects' past, their disappearance adds fresh mystery.
One small press's disappearance does not spell the end of university-press
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