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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.

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.

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


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