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irruption has 2 distinct synonyms spread across 1 of its 3 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
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”
Synonyms, antonyms and the broader and narrower relations for irruption come from Princeton University’s WordNet. Full sources and licences.