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

However, an interesting aspect of this intrusion of Arctic air is the possibility of snow in the Tampa Bay area of Florida. —Marshall Shepherd, Forbes.com, 29 Jan. 2026

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

But the intermission that the set change demands seems like an intrusion in a play that could do without the realistic detail. —Theater Critic, Los Angeles Times, 28 Jan. 2026

The comparatively uptight Pari (Mahshad Bahraminejad) mounts nonlinear plays that depict the intrusion of political anxiety on everyday Iranian spaces. —David Ehrlich, IndieWire, 28 Jan. 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)