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

The move has sparked backlash, with opponents arguing that part of the purpose of the memorials is their subtle intrusion into everyday life. — Sophie Tanno, CNN Money, 26 Sep. 2026

Chen said the specific intrusion method used to enter Bitget’s systems remain under technical investigation. — Matthew Tan, CNBC, 25 Sep. 2026

The underground trespassing is the latest in a string of similar incidents, including a May 28 intrusion through a Brooklyn manhole that led to two arrests. — Rocco Parascandola, New York Daily News, 23 Sep. 2026

Following a Wall Street Journal report, Google has confirmed that Gemini models hacked three companies during a May 2026 test, but the nature of the intrusion isn’t as troubling (or impressive) as previous AI hacks. — Ryan Whitwam, ArsTechnica, 21 Sep. 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)