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 Sister Rice’s slight frame and placid persona belied the physical undertaking of her intrusion at Y-12 and the magnitude of its repercussions. Washington Post, 11 Oct. 2021 But conservatives fear government intrusion into the family realm. New York Times, 9 Oct. 2021 Republicans are opposed to Biden's bigger vision, deriding the $3.5 trillion package as a slide toward socialism and government intrusion on Americans lives. Compiled Democrat-gazette Staff From Wire Reports, Arkansas Online, 30 Sep. 2021 Hun Sen’s party, Sok Eysan, initially denied that the intrusion and exchange had taken place, saying the video clip was a fabrication. Sopheng Cheang, ajc, 18 Sep. 2021 As part of the Pegasus Project, forensic analyses revealed that 67 phones had shown signs of a successful Pegasus infection or intrusion attempt. Craig Timberg, Drew Harwell And Reed Albergotti, Anchorage Daily News, 13 Sep. 2021 The attack marks another high-profile intrusion in a year when hackers have grown more brazen. William Turton And Kartikay Mehrotra / Bloomberg, Time, 9 Sep. 2021 Vermeer's subjects are sometimes interrupted by our presence, turning to gaze at our intrusion. CNN, 8 Sep. 2021 Local residents in the Nordelta district of the country's capital city have complained about the rodents' intrusion. Gabriela Miranda, USA TODAY, 2 Sep. 2021

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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Time Traveler for intrusion

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

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Last Updated

14 Oct 2021

Cite this Entry

“Intrusion.” Dictionary, Merriam-Webster, Accessed 17 Oct. 2021.

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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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