Definition of irruption
plural irruptions
:an act or instance of irrupting: such as
a
:a sudden, violent, or forcible entry :a rushing or bursting in
- …the assassination still feels like a primal catastrophe—an irruption of inexplicable evil as horrifying as any supernatural bogeyman.
- —Ross Douthat
b
:a sudden and violent invasion
- …begins not with Hitler's attack on Poland, but with the Japanese irruption into Outer Mongolia in July 1939…
- —John Gooch
c
ecology
:a sudden sharp increase in the relative numbers of a natural population usually associated with favorable alteration of the environment
- The owl's appearance came during an irruption, a huge southward migration of snowy owls from their arctic territories that, this year, followed a successful breeding period.
- —Scott Carroll
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