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invasion 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.
the act of invading; the act of an army that invades for conquest or plunder
any entry into an area not previously occupied
“an invasion of tourists”
Synonyms, antonyms and the broader and narrower relations for invasion come from Princeton University’s WordNet. Full sources and licences.
(pathology) the spread of pathogenic microorganisms or malignant cells to new sites in the body
“the tumor's invasion of surrounding structures”