• WordNet 3.6
    • n irruption a sudden violent entrance; a bursting in "the recent irruption of bad manners"
    • n irruption a sudden violent spontaneous occurrence (usually of some undesirable condition) "the outbreak of hostilities"
    • n irruption a sudden sharp increase in the relative numbers of a population
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Webster's Revised Unabridged Dictionary
    • Irruption A bursting in; a sudden, violent rushing into a place; as, irruptions of the sea. "Lest evil tidings, with too rude irruption Hitting thy aged ear, should pierce too deep."
    • Irruption A sudden and violent inroad, or entrance of invaders; as, the irruptions of the Goths into Italy.
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Century Dictionary and Cyclopedia
    • n irruption A bursting in; a breaking or rushing into a place; a sudden invasion or incursion.
    • n irruption Synonyms Foray, raid.
    • ***
Chambers's Twentieth Century Dictionary
    • n Irruption ir-rup′shun a breaking or bursting in: a sudden invasion or incursion
    • ***


Webster's Revised Unabridged Dictionary
L. irruptio,: cf. F. irruption,. See Irrupted
Chambers's Twentieth Century Dictionary
Fr.,—L. irruption-emin, in, rumpĕre, ruptum, to break.


In literature:

There has been more than one irruption into the country from the natives to the northward.
"The Mission" by Frederick Marryat
The land elevated above sea-level is safe from these irruptions.
"Library Of The World's Best Literature, Ancient And Modern, Vol 6" by Various
The War Department is wholly unprepared for an irruption here, and J.E.B.
"The Every-day Life of Abraham Lincoln" by Francis Fisher Browne
The old housekeeper and the butler were in a panic at this dangerous irruption.
"Bracebridge Hall" by Washington Irving
We're having an irruption of them here now ... the Goths sacking the sacred city.
"Queed" by Henry Sydnor Harrison
It is a popular protest against the irruption of foreign customs.
"Lippincott's Magazine Of Popular Literature And Science, April 1875, Vol. XV., No. 88" by Various
The irruption of the Huns was a devastating scourge, which terrified the world.
"The Empire of Russia" by John S. C. Abbott
An irruption of Eastern invalids had filled the house to overflowing, and new faces met them at every turn.
"Clover" by Susan Coolidge
That this irruption of the enemy gave a taci-turn to our riotry and revelling will be believed.
"The English Gipsies and Their Language" by Charles G. Leland
Domi'tian soon found the want of so experienced a commander, in the many irruptions of the barbarous nations that surrounded the empire.
"Pinnock's Improved Edition of Dr. Goldsmith's History of Rome" by Oliver Goldsmith

In news:

Snowy owl ' irruption ' leads to southern sightings.
The first was the Rough-legged Hawk, that irrupts from the north.
Snowy owl 'irruption' leads to southern sightings.
The tree seed crop, normally plentiful in the forests of Ontario and Quebec, has in some cases failed, causing what is known as a bird irruption.