Webster's Revised Unabridged Dictionary · 1913

Intrusion

Intrusion , noun

[Compare French intrusion. See Intrude.]

1.
The act of intruding, or of forcing in; especially, the forcing (one's self) into a place without right or welcome; encroachment.
Why this intrusion? Were not my orders that I should be private? — Addison
2.
(Geology) The penetrating of one rock, while in a plastic or metal state, into the cavities of another.
3.
(Law) The entry of a stranger, after a particular estate or freehold is determined, before the person who holds in remainder or reversion has taken possession.
4.
(Scotch Ch.) The settlement of a minister over a congregation without their consent.