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[ih-ruhp-shuh n] /ɪˈrʌp ʃən/
a breaking or bursting in; a violent incursion or invasion.
Ecology. a sudden increase in an animal population.
Origin of irruption
1570-80; < Latin irruptiōn- (stem of irruptiō), equivalent to irrupt(us), past participle of irrumpere to burst into (see ir-1, rupture) + -iōn- -ion
Can be confused
eruption, irruption. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for irruption
  • There is scarcely an angelic irruption into the ordinary fabric of life or a satanic worldwide conspiracy in the lot.
  • The smallest of the forest birds, high stress was placed on the white-eyes during the snake's irruption.
  • Dynamic autoinoculation and the microbial ecology of a deep water hydrocarbon irruption.
  • If pain or irruption persists, seek medical attention.
  • As sometimes happens when a new species reaches an island with suitable habitat, an irruption followed.
Word Origin and History for irruption

1570s, from Middle French irruption or directly from Latin irruptionem (nominative irruptio) "a breaking in, bursting in, invasion," noun of action from past participle stem of irrumpere, from assimilated form of in- "into, in, on, upon" (see in- (2)) + rumpere (see rupture (n.)). Frequently confused with eruption.

Online Etymology Dictionary, © 2010 Douglas Harper
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irruption in Medicine

irruption ir·rup·tion (ĭ-rŭp'shən)
The act or process of breaking through to a surface.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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