from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The act of intruding or the condition of being intruded on.
  • noun An inappropriate or unwelcome addition.
  • noun The forcing of molten rock into an earlier formation.
  • noun The rock mass produced by an intrusive process.

from The Century Dictionary.

  • noun The act of intruding; the act of entering without warrant or justification; unbidden, unwelcome, or unfit entrance into or upon anything.
  • noun Specifically, in law: A wrongful entry after the determination of a particular estate, say for life, and before the freehold remainderman or reversioner can enter.
  • noun In English law, any trespass committed on the public lands of the crown, as by entering thereon without title, holding over after a lease is determined, taking the profits, cutting down timber, and the like.
  • noun Usurpation, as of an office.—
  • noun A thrusting or pushing in, as of something out of place; irregular or abnormal entrance or irruption: as, an intrusion of foreign matter; the intrusion of extrinsic rocks or dikes in a geological formation. See intrusive rocks, under intrusive.

from the GNU version of the Collaborative International Dictionary of English.

  • noun The act of intruding, or of forcing in; especially, the forcing (one's self) into a place without right or welcome; encroachment.
  • noun (Geol.) The penetrating of one rock, while in a plastic or metal state, into the cavities of another.
  • noun (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.
  • noun (Scotch Ch.) The settlement of a minister over a congregation without their consent.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The forcible inclusion or entry of an external group or individual; the act of intruding.
  • noun geology Magma forced into other rock formations; the rock formed when such magma solidifies.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun rock produced by an intrusive process
  • noun the forcing of molten rock into fissures or between strata of an earlier rock formation
  • noun any entry into an area not previously occupied
  • noun entrance by force or without permission or welcome
  • noun entry to another's property without right or permission


Sorry, no etymologies found.


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  • Canonists also extend the term intrusion to the keeping possession of a benefice by a hitherto lawful possessor, after it has been vacated by violation of certain decrees of the Church.

    The Catholic Encyclopedia, Volume 8: Infamy-Lapparent 1840-1916 1913

  • There wasn't a lot of what they call intrusion into the cabin.

    CNN Transcript Oct 11, 2007 2007

  • It is the fashion of a modern school of historical writers to deplore what they call the intrusion of literature into history.

    Historical and Political Essays William Edward Hartpole Lecky 1870

  • Dr. Mausner said the newly office-less employees might be feeling both what he called intrusion anxiety and exposure anxiety.

    NYT > Home Page By JONATHAN VATNER 2010

  • Dr. Mausner said the newly office-less employees might be feeling both what he called intrusion anxiety and exposure anxiety.

    NYT > Home Page By JONATHAN VATNER 2010

  • Those who say they were contacted to become informants express alarm at what they call intrusion in places of worship and private lives without reasonable cause. - Nation-World 2009

  • Second, what does it say about ourselves if we think this kind of intrusion is acceptable?

    Creepy Birthday to You 2007

  • Birth control pills are also condemned by Church doctrine, so how much power does the Church really want in intrusion into personal choice and state issues. – too much!

    Bishops slam 'unacceptable' health care bill 2009

  • This week's intrusion from the outside world comes courtesy of Becky's mum and dad, whose discomfort in the flat is inevitably confounded by Steve's inability to not be an idiot: Are you sure you don't want a yoghurt?

    Tonight's TV highlights Jonathan Wright 2010

  • The intrusion is minimal and the investigation is ongoing (that is, the police have no yet established that no laws are being broken — that is precisely what they are attempting to figure out by identifying the unknown man and determining if he is a trespasser).

    The Volokh Conspiracy » An Interesting Case Involving Open Carry, Defense of Property, and Allegedly Resisting Arrest 2010


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