a breaking or bursting in; a violent incursion or invasion.
Ecology. a sudden increase in an animal population.

1570–80; < Latin irruptiōn- (stem of irruptiō), equivalent to irrupt(us), past participle of irrumpere to burst into (see ir-1, rupture) + -iōn- -ion

eruption, irruption. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
irrupt (ɪˈrʌpt)
1.  to enter forcibly or suddenly
2.  (of a plant or animal population) to enter a region suddenly and in very large numbers
3.  (of a population) to increase suddenly and greatly
[C19: from Latin irrumpere to rush into, invade, from rumpere to break, burst]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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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Example sentences
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
If pain or irruption persists, seek medical attention.
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