the act of imploding; a bursting inward (opposed to explosion ).
the occlusive phase of stop consonants.
(of a stop consonant) the nasal release heard in the common pronunciation of eaten, sudden, or mitten, in which the vowel of the final syllable is greatly reduced.
the ingressive release of a suction stop. Compare plosion.

1875–80; im-1 + (ex)plosion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
implosion (ɪmˈpləʊʒən)
1.  the act or process of imploding: the implosion of a light bulb
2.  phonetics the suction or inhalation of breath employed in the pronunciation of an ingressive consonant

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"a bursting inward," 1877, modeled on explosion (q.v.). Originally in ref. to effect of deep sea pressures. Fig. sense is from 1960. Verb implode is from 1881.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

implosion im·plo·sion (ĭm-plō'zhən)

  1. A type of behavior therapy in which the patient is repeatedly subjected to anxiety-arousing stimuli while the therapist attempts to extinguish the patient's anxiety and anxious behavior and replace them with more appropriate responses.

  2. A bursting inward rather than outward.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Some who foresaw the implosion underestimated its power and duration.
None of these attempts survived the dot-com implosion.
The implosion of the core causes it to rotate rapidly, up to hundreds of times
  per second.
There is a video of a building whose implosion went wrong, and it stayed up,
  albeit leaning.
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