im·plo·sion

[im-ploh-zhuhn]
noun
1.
the act of imploding; a bursting inward ( opposed to explosion ).
2.
Phonetics.
a.
the occlusive phase of stop consonants.
b.
(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.
c.
the ingressive release of a suction stop. Compare plosion.

Origin:
1875–80; im-1 + (ex)plosion

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
implosion (ɪmˈpləʊʒən) [Click for IPA pronunciation guide]
 
n
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
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00:10
Implosion is a GRE word you need to know.
So is impair. Does it mean:
to make or cause to become worse; diminish in ability, value, excellence, etc.; weaken or damage:
Absolutely necessary or required; unavoidable | Zorunlu, mecburi
Etymonline
Word Origin & History

implosion
"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)
n.

  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
They are strongly absorbed, however, by the high-Z inner shell and can greatly
  affect the implosion characteristics.
Now he's playing for a ring while his former team deals with the aftermath of
  its implosion.
In the implosion region, the radius o f this metal surface is determined by the
  inner radius of the implosion liner.
There is a video of a building whose implosion went wrong, and it stayed up,
  albeit leaning.
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