In*tru"sion (?), n. [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
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.
© Webster 1913.