in·​tru·​sion | \ in-ˈtrü-zhən How to pronounce intrusion (audio) \

Definition of intrusion

1 : the act of intruding or the state of being intruded especially : the act of wrongfully entering upon, seizing, or taking possession of the property of another
2 : the forcible entry of molten rock or magma into or between other rock formations also : the intruded magma

Examples of intrusion in a Sentence

Recent Examples on the Web

Pinyo Pukpinyo, 50, recently responded to a call of a 16-foot python slithering through the rafters of a home in Bangkok, where snake intrusions are far more common than fires. Fox News, "Thai firefighter wrangles 16-foot python with bare hands, wrestles it into rice sack," 22 Aug. 2019 And the plot of The Nickel Boys tolerates no fissures in the fabric of ordinary reality; no surreal intrusions complicate the grim progress of this story. Ron Charles, Dallas News, "In Colson Whitehead's 'The Nickel Boys,' an idealistic black teen learns a harsh reality," 9 July 2019 The intrusion occurred the same day President Trump called off a strike on Iranian targets like radar and missile batteries. New York Times, "U.S. Carried Out Cyberattacks on Iran," 22 June 2019 Enforcement of Warren’s plan could also lead to intrusion into poor countries’ internal affairs. Noah Smith, Twin Cities, "Noah Smith: Warren’s trade plan does poor nations no favors," 16 Aug. 2019 Water intrusion or obvious gaps in the attic are a major warning sign. Ap Mcclatchy, The Mercury News, "Angie’s List: How to decide whether to repair or replace your roof," 31 July 2019 Superintendent David Sewell confirmed the attack to the Dothan Eagle but has not commented if the intrusion was ransomware, in which hackers demand money in return for freeing the data. Leada Gore |, al, "Alabama school system forced to move start date again due to malware attack," 31 July 2019 The company warned that the intrusions could be a precursor to attacks on U.S. campaigns and election systems. Robert Hackett, Fortune, "Lessons from the Pentagon, Oracle, CrowdStrike, and an Ex-CIA Entrepreneur at Brainstorm Tech 2019—Cyber Saturday," 20 July 2019 So to come around the bend from Hog Island and see this intrusion that’s really industrial in nature is very jarring. Washington Post, "Feds reconsidering permit for power lines near historic Jamestown, but there’s a hitch: They’re already built," 18 July 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'intrusion.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of intrusion

15th century, in the meaning defined at sense 1

History and Etymology for intrusion

Middle English, from Anglo-French, from Medieval Latin intrusion-, intrusio, from Latin intrudere

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Statistics for intrusion

Last Updated

2 Sep 2019

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Time Traveler for intrusion

The first known use of intrusion was in the 15th century

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More Definitions for intrusion


in·​tru·​sion | \ in-ˈtrü-zhən How to pronounce intrusion (audio) \

Kids Definition of intrusion

1 : the act of going or forcing in without being wanted
2 : something that goes in or interferes without being wanted The phone call was an unwelcome intrusion.


in·​tru·​sion | \ in-ˈtrü-zhən How to pronounce intrusion (audio) \

Legal Definition of intrusion

1a : the entry at common law of a stranger after a particular estate of freehold is determined before the person who holds it in remainder or reversion has taken possession
b : the act of wrongfully entering upon, seizing, or taking possession of the property of another
2 : a trespassing on or encroachment upon something (as a right) the Fourth Amendment demands that the showing of justification match the degree of intrusionBerger v. New York, 388 U.S. 41 (1968)

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Comments on intrusion

What made you want to look up intrusion? Please tell us where you read or heard it (including the quote, if possible).


authorized for issue (as a bond)

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