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

This would not have been the case prior to media intrusion in our relationship. —Jack Royston, MSNBC Newsweek, 10 Dec. 2025

In 2020, Harry and Markle — who currently reside in California — made their royal exit, citing the unbearable intrusions of the British press and lack of support from the palace. —Christina Dugan Ramirez, FOXNews.com, 8 Dec. 2025

Councilors Ed Flynn and Erin Murphy are calling for the city to tighten up security protocols in light of the intrusion and theft revealed in an email from the city’s property management department that was sent to City Hall staff on Tuesday and obtained by the Herald. —Gayla Cawley, Boston Herald, 3 Dec. 2025

Two other likely suspects are concerns familiar to many barrier island residents — construction vibration and the increasing intrusion of water that climate change is only making worse. —Denise Hruby, Miami Herald, 1 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)