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

Indeed, if this technology works as expected (and the crust doesn't find new ways to fight back against our intrusions), and the economics stack up, this new use for gyrotrons could ironically end up putting fusion reactors out of a job. —New Atlas, 23 Feb. 2025

Though the phenomenon has been occurring for years, warming temperatures means these intrusions are occurring more frequently. —Simmone Shah, TIME, 12 Feb. 2025

This is a place to check one’s personal life at the door, and the occasional intrusions from outside feel forced. —Inkoo Kang, The New Yorker, 8 Feb. 2025

Before Carr's involvement, CBS had refused to release those materials, calling Trump's demand for them an intrusion on its journalists' First Amendment rights. —David Folkenflik, NPR, 6 Feb. 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)