irruption

[ ih-ruhp-shuhn ]
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noun
  1. a breaking or bursting in; a violent incursion or invasion.

  2. Ecology. a sudden increase in an animal population.

Origin of irruption

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

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