intrusion

noun

in·​tru·​sion in-ˈtrü-zhən 

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

Concerns about further state intrusion have also surfaced in recent months. —Jasmine Baehr, FOXNews.com, 1 Jan. 2026

Four others, all under the age of 25, were charged alongside Urban in 2024 for allegedly being part of Scattered Spider’s cyber intrusion and crypto theft scheme, including an unnamed minor. —Amanda Gerut, Fortune, 1 Jan. 2026

Soon after settling in, her parents asked for a copy of her spare key, framing the request as a precaution rather than an intrusion. —Ashley Vega, PEOPLE, 30 Dec. 2025

Prosecutors say the group operated across Venezuela, Colombia, Mexico, Spain and the United States, with members assigned specialized roles ranging from cyber intrusion and logistics to cash collection and money laundering. —Antonio María Delgado, Miami Herald, 28 Dec. 2025

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

Phrases Containing intrusion

• anti-intrusion

Rhymes for intrusion

• allusion
• collusion
• conclusion
• confusion
• contusion
• delusion
• diffusion
• effusion
• exclusion
• extrusion
• illusion
• inclusion

Kids Definition

intrusion

noun

in·​tru·​sion in-ˈtrü-zhən 

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 

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 intrusion

—Berger v. New York, 388 U.S. 41 (1968)