Intrusion, n.
Etymology: [Cf. F. 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. (Geol.)
The penetrating of one rock, while in a plastic or metal state, into the cavities of another.
3. (Law)
3 more senses
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 3 congregation without their consent.