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

Asked about the intrusion, the IDF referred NBC News to the police, who did not respond to a request for comment. —Molly Hunter, NBC news, 2 May 2026

The crumbling concrete on the balconies has allegedly left holes that expose reinforcement steel, leading to rust, corrosion, and water intrusion. —Larry Seward, CBS News, 1 May 2026

Harry and Meghan stepped back from their senior royal roles in 2020 due to media intrusion and racist coverage, eventually taking residence in Canada and, later, California, with their two children – Prince Archie, 6, and Princess Lilibet, 4. —Kathryn Palmer, USA Today, 29 Apr. 2026

The Duke and Duchess of Sussex stepped back as senior royals in 2020, citing the unbearable intrusions of the British press and a lack of support from the palace. —Stephanie Nolasco, FOXNews.com, 28 Apr. 2026

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)