'Intrusion' definitions:

Definition of 'intrusion'

(from WordNet)
noun
Any entry into an area not previously occupied; "an invasion of tourists"; "an invasion of locusts" [syn: invasion, encroachment, intrusion]
noun
Entrance by force or without permission or welcome
noun
The forcing of molten rock into fissures or between strata of an earlier rock formation
noun
Rock produced by an intrusive process
noun
Entry to another's property without right or permission [syn: trespass, encroachment, violation, intrusion, usurpation]

Definition of 'Intrusion'

From: GCIDE
  • Intrusion \In*tru"sion\, n. [Cf. F. intrusion. See Intrude.] [1913 Webster]
  • 1. The act of intruding, or of forcing in; especially, the forcing (one's self) into a place without right or welcome; encroachment. [1913 Webster]
  • Why this intrusion? Were not my orders that I should be private? --Addison. [1913 Webster]
  • 2. (Geol.) The penetrating of one rock, while in a plastic or metal state, into the cavities of another. [1913 Webster]
  • 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. [1913 Webster]
  • 4. (Scotch Ch.) The settlement of a minister over a congregation without their consent. [1913 Webster]