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irruption

[ih-ruhp-shuh n] /ɪˈrʌp ʃən/
noun
1.
a breaking or bursting in; a violent incursion or invasion.
2.
Ecology. a sudden increase in an animal population.
Origin
1570-1580
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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Origin and History for irruptions

irruption

n.

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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irruptions in Medicine

irruption ir·rup·tion (ĭ-rŭp'shən)
n.
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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