intrusion

UK: /ɪnˈtruːʒ^ən/ US: /ɪnˈtruʒən/ ,(in tro̅o̅′zhən)

WordReference Random House Learner's Dictionary of American English © 2025

in•tru•sion /ɪnˈtruʒən/   n. 

1. an act or instance of intruding:
   [uncountable] She hated the intrusion into her private life.
   [countable] The press made intrusions into his private life.

in•tru•sive /ɪnˈtrusɪv/  adj.: 

an intrusive question.

in•tru•sive•ly, adv. 
in•tru•sive•ness, n. [uncountable] See -trude-.

WordReference Random House Unabridged Dictionary of American English © 2025

in•tru•sion  (in tro̅o̅′zhən), n. 

1. an act or instance of intruding.
2. the state of being intruded.
3. Law
   • an illegal act of entering, seizing, or taking possession of another's property.
   • a wrongful entry after the determination of a particular estate, made before the remainderman or reversioner has entered.
4. Geology
   • emplacement of molten rock in preexisting rock.
   • plutonic rock emplaced in this manner.
   • a process analogous to magmatic intrusion, as the injection of a plug of salt into sedimentary rocks.
   • the matter forced in.

• s) + -iōn- -ion
• Medieval Latin intrūsiōn- (stem of intrūsiō), equivalent. to Latin intrūs(us), past participle of intrūdere to intrude (equivalent. to intrūd- v.stem + -tus past participle suffix, with dt
• Middle English 1250–1300

in•tru′sion•al, adj. 

Collins Concise English Dictionary © HarperCollins Publishers::

intrusion / ɪnˈtruːʒən/ noun

1. the act or an instance of intruding; an unwelcome visit, interjection, etc: an intrusion on one's privacy
2. the movement of magma from within the earth's crust into spaces in the overlying strata to form igneous rock
3. any igneous rock formed in this way
4. an unlawful entry onto land by a stranger after determination of a particular estate of freehold and before the remainderman or reversioner has made entry

inˈtrusional adjective