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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
Historical Examples
  • The irruption of Bennie and Zephyr threatened disaster even to this forlorn hope.

    Blue Goose Frank Lewis Nason
  • To this irruption succeeded an interval of peace—the calm before the storm.

    Leila, Complete Edward Bulwer-Lytton
  • The age of Theocritus and Bion has given place to—shall we say the age of the Cæsars, or the irruption of the barbarians?

  • There was no irruption of the newly-weds to complicate matters.

    Wanted: A Husband Samuel Hopkins Adams
  • Once more she ascended the stairs and made an irruption into the boy's chamber.

    Helping Himself Horatio Alger
  • Then followed the revolution with the irruption of Cromwell's followers.

  • Timid groups of persons were round about, waiting for the irruption of the gentlemen, until the pleasure should begin.

    The Newcomes William Makepeace Thackeray
  • We picture the vision, then, as an irruption of hypnosis into the visual sphere.

  • It began to look indeed as if there was an irruption of them into that section of the Louisiana Territory.

    The Hunters of the Ozark Edward S. Ellis
  • You may choose where the irruption shall occur; there must be a bursting-in at some point.

    Omphalos Philip Henry Gosse
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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