noun

intrusion

in-TROO-zhun/ɪnˈtruːʒn/

Entry that pushes into an existing space from outside.

A hand pushing through the doorway is an unwelcome intrusion.

A hand from outside interrupts a quiet writing desk by pushing through the doorway.

Etymology

inLatinin, into

+trusLatinto thrust, push

+ionLatinaction or process

The components describe an act of “thrusting in.” The word's early use for unjust invasion of property or usurpation of office connects that image with today's unwanted entry or interference.

In context

Center for Strategic & International Studies70:46

the intrusion of the eu into parts of british life which is which is viewed as not subject to a foreign power has created political issues in the uk

After the Scottish Referendum: What are the Future Transatlantic Security Implications?

More examples

She regards questions about her salary as an intrusion.
The alarm warns us of an intrusion into the building.
The granite intrusion formed when magma pushed into older rock.

Forms

intrusion · intrusions

intrude verb — To enter or interfere without invitation.

intrusive adjective — Entering or interfering in an unwelcome way.

Similar words

encroachment: Emphasizes gradual advances into another's space, rights, or territory.
invasion: Suggests forceful entry, often involving conquest or large numbers.
interference: Emphasizes disruption of an activity rather than entry itself.