What is Intrusion?

Intrusion definition and meaning on Dictionary terms:
an act or instance of intruding.
the state of being intruded.
Law. an illegal act of entering, seizing, or taking possession of another’s property. a wrongful entry after the determination of a particular estate, made before the remainderman or reversioner has entered.

Geology. emplacement of molten rock in preexisting rock. plutonic rock emplaced in this manner. a process analogous to magmatic intrusion, as the injection of a plug of salt into sedimentary rocks. the matter forced in.