A bursting in; a sudden, violent rushing into a place; as, irruptions of the sea.
A sudden and violent inroad, or entrance of invaders; as, the irruptions of the Goths into Italy.
A rapid increase in the density of a population. Often followed by massive emigration.
a sudden violent entrance; a bursting in; "the recent irruption of bad manners"
a sudden sharp increase in the relative numbers of a population
a sudden violent spontaneous occurrence (usually of some undesirable condition); "the outbreak of hostilities"
an irregular movement of an animal population out of an area, with no return, caused by a sudden, explosive increase in that animal's numbers
(i rupt' sh n) A rapid and dramatic increase in a population.