Main Entry: in·tru·sion

Pronunciation: \in-ˈtrü-zhən\

Function: noun

Etymology: Middle English, from Anglo-French, from Medieval Latin intrusion-, intrusio, from Latin intrudere

Date: 15th century

1 : the act of intruding or the state of being intruded; especially : the 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 formations; also : the intruded magma