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  • Definition
    • intrusion : The forcible inclusion or entry of an external group or individual; the act of intruding.

      • intrusion : Magma forced into other rock formations; the rock formed when such magma solidifies.

        • intrusion : A structure that lies within a historic district but is nonhistoric and irrelevant to the district.

          • intrusion : The insertion of a phoneme into the pronunciation of a word despite its absence from the spelling. (e.g. intrusive r)

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          • Derivative