Etymology
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irruption (n.)

1570s, from French irruption (14c.) or directly from Latin irruptionem (nominative irruptio) "a breaking in, bursting in, invasion," noun of action from past-participle stem of irrumpere "to break in, force one's way in, burst into," from assimilated form of in- "into, in, on, upon" (from PIE root *en "in") + rumpere (see rupture (n.)). Frequently confused with eruption.

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Definitions of irruption

irruption (n.)
a sudden violent entrance; a bursting in;
the recent irruption of bad manners
irruption (n.)
a sudden sharp increase in the relative numbers of a population;
irruption (n.)
a sudden violent spontaneous occurrence (usually of some undesirable condition);
Synonyms: outbreak / eruption
From wordnet.princeton.edu