irruption (n.) Look up irruption at
1570s, from Middle 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" (see in- (2)) + rumpere (see rupture (n.)). Frequently confused with eruption.