ɪŋˈkɹoʊt͡ʃmənt ɪnˈtɹuːʒən ɪnˈveɪʒən ˌvaɪəˈleɪʃən entrance by force or without permission or welcome entry to another's property without right or permission any entry into an area not previously occupied an invasion of tourists an invasion of locusts rock produced by an intrusive process the forcing of molten rock into fissures or between strata of an earlier rock formation