[ ih-ruhp-shuh n ]
/ ɪˈrʌp ʃən /


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


Nearby words

  1. irritation fibroma,
  2. irritative,
  3. irrorate,
  4. irrotational,
  5. irrupt,
  6. irruptive,
  7. irs,
  8. irtysh,
  9. irv,
  10. irvine

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 confusederuption irruption Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for irruption

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

Medicine definitions for irruption


[ ĭ-rŭpshən ]


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.