intrusion

noun

in·​tru·​sion in-ˈtrü-zhən How to pronounce intrusion (audio)
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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
This significantly lowers the barrier for cyberattacks and increases the speed and efficiency of data theft—sometimes in minutes, before security teams even detect an intrusion. 3. Keren Katz, Forbes, 21 Mar. 2025 No casualties were recorded during this intrusion, and no radio station employees were present at the scene. Jacqueline Charles, Miami Herald, 16 Mar. 2025 Members of a generation that’s been addled by the internet’s intrusions since birth, many of them seem much less bullish about chasing mass appeal. Rachel Syme, The New Yorker, 12 Mar. 2025 The airspace intrusions in the heavily congested south Florida airspace have prompted fighter jet intercepts but did not alter Mr. Trump's schedule or impact his security, officials said. CBS News, 9 Mar. 2025 See All Example Sentences for intrusion

Word History

Etymology

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

First Known Use

15th century, in the meaning defined at sense 1

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

Browse Nearby Words

Cite this Entry

“Intrusion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/intrusion. Accessed 25 Mar. 2025.

Kids Definition

intrusion

noun
in·​tru·​sion in-ˈtrü-zhən How to pronounce intrusion (audio)
1
: the act of intruding : the state of being intruded
2
: the entry by force of melted rock into or between other rock formations

Legal Definition

intrusion

noun
in·​tru·​sion in-ˈtrü-zhən How to pronounce intrusion (audio)
1
a
: 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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