intrusion
in.tru.sion \in-'tru:-zh*n\ n [ME, fr. MF, fr. ML intrusion-, intrusio, fr. L intrusus, pp.] of intrudere 1: the act of intruding or the state of being intruded; specif : th e act of wrongfully entering upon, seizing, or taking possession of the property of another 2: the forcible entry of molten rock or magma into or between other rock fo rmations; also : the intruded magma