Definitions from Wiktionary (intrusion)

▸ noun:  The forcible inclusion or entry of an external group or individual; the act of intruding.
▸ noun:  (geology) Magma forced into other rock formations; the rock formed when such magma solidifies.
▸ noun:  A structure that lies within a historic district but is nonhistoric and irrelevant to the district.
▸ noun:  (phonology) The insertion of a phoneme into the pronunciation of a word despite its absence from the spelling. (e.g. intrusive r)
▸ noun:  (psychology) An involuntarily arising idea or memory that is nuisant and falsifies an accurate impression of the world.
▸ Also see intrusion

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