1. irruption(n = noun.act) - a sudden violent entrance; a bursting in; "the recent irruption of bad manners"
is a kind of entering, entrance, entry, incoming, ingress
Derived form verb irrupt1
2. irruption(n = noun.process) - a sudden sharp increase in the relative numbers of a population;
is a kind of population growth
3. irruption(n = noun.event) eruption, outbreak - a sudden violent spontaneous occurrence (usually of some undesirable condition); "the outbreak of hostilities"
is a kind of happening, natural event, occurrence, occurrent
has particulars: epidemic, recrudescence
Derived form verb irrupt2
1. A bursting in; a sudden, violent rushing into a place; as, irruptions of the sea. [1913 Webster]
"Lest evil tidings, with too rude irruption
Hitting thy aged ear, should pierce too deep." [1913 Webster]
2. A sudden and violent inroad, or entrance of invaders; as, the irruptions of the Goths into Italy. Addison.
N attack, assault, assault and battery, onset, onslaught, charge, aggression, offense, incursion, inroad, invasion, irruption, outbreak, estrapade, ruade, coupe de main, sally, sortie, camisade, raid, foray, run at, run against, dead set at, storm, storming, boarding, escalade, siege, investment, obsession, bombardment, cannonade, fire, volley, platoon fire, file fire, fusillade, sharpshooting, broadside, raking fire, cross fire, volley of grapeshot, whiff of the grape, feu d'enfer, cut, thrust, lunge, pass, passado, carte and tierce, home thrust, coupe de bec, kick, punch, battue, razzia, Jacquerie, dragonnade, devastation, eboulement, assailant, aggressor, invader, base of operations, point of attack, echelon, attacking, aggressive, offensive, obsidional, up in arms, on the offensive, Int, up and at them!, the din of arms, the yell of savage rage, the shriek of agony, the groan of death, their fatal hands no second stroke intend, thirst for glory quells the love of life.
N ingress, entrance, entry, introgression, influx, intrusion, inroad, incursion, invasion, irruption, ingression, penetration, interpenetration, illapse, import, infiltration, immigration, admission, insinuation, insertion, inlet, way in, mouth, door, barway, path, conduit, immigrant, incoming.