1. : to enter for conquest or plunder. 2. : to encroach upon : infringe. 3. a. : to spread over or into as if invading : permeate. doubts invade his mind. b. : to affect injuriously and progressively. gangrene invades healthy tissue. invader noun. Synonyms. foray (into) overrun. raid. See all Synonyms & Antonyms in Thesaurus. More @Wikipedia
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