irruption

[ ih-ruhp-shuhn ]

/ ɪˈrʌp ʃən /

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noun

a breaking or bursting in; a violent incursion or invasion.

Ecology. a sudden increase in an animal population.

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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

eruption, irruption

He made but one fierce and rapid irruption into the neighborhood of the "red sea," and returned sick and shuddering therefrom.
Harper's New Monthly Magazine, No. VII, December 1850, Vol. II|Various
Came a great irruption of new social, religious, and political ideas into the general European mind.
The Outline of History: Being a Plain History of Life and Mankind|Herbert George Wells
By the retreat of Torstensohn, the Emperor was relieved from all fears of an irruption on the side of Bohemia.
The Thirty Years War, Complete|Friedrich Schiller
The irruption of Bennie and Zephyr threatened disaster even to this forlorn hope.
Blue Goose|Frank Lewis Nason

Tamerlane made his irruption through this plain when he took and destroyed so many cities.
Early Travels in Palestine|Arculf et al.

irruption

[ ĭ-rŭp′shən ]

The act or process of breaking through to a surface.