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 another2: the forcible entry of molten rock or magma into or between other rock formations ; also : the intruded magma