intrude
in·trude / inˈtroōd/ • v. 1. [intr.] put oneself deliberately into a place or situation where one is unwelcome or uninvited: he had no right to intrude into their lives she felt awkward at intruding on private grief. ∎ enter with disruptive or adverse effect: politics quickly intrude into the booklet. ∎ [tr.] introduce into a situation with disruptive or adverse effect: to intrude political criteria into military decisions risks reducing efficiency.2. [tr.] Geol. (of igneous rock) be forced or thrust into (a preexisting formation): the granite may have intruded these rock layers. ∎ (usu. be intruded) force or thrust (igneous rock) into a preexisting formation.
intrusion
in·tru·sion / inˈtroōzhən/ • n. 1. the action of intruding: he was furious about this intrusion into his private life | unacceptable intrusions of privacy. ∎ a thing that intrudes: they oppose the excavations as an intrusion on their heritage.2. Geol. the action or process of forcing a body of igneous rock between or through existing formations, without reaching the surface. ∎ a body of igneous rock that has intruded the surrounding strata.
intrusion
intruder
in·trud·er / inˈtroōdər/ • n. a person who intrudes, esp. into a building with criminal intent.
intrude
So intrusion (leg.) thrusting oneself into an estate or benefice XIV; uninvited entrance or appearance XVI. — (O)F. or medL.