intrusion
UK: ɪnˈtruːʒən | US: ɪnˈtruːʒən
n. the act of entering a place or situation without permission or welcome
n. (geology) the forcing of molten rock into fissures or between strata
n. (computing) unauthorized access to a system or network
The word "intrusion" originates from Latin intrudere ("to thrust into"), composed of in- (into) and trudere (to push or thrust). The suffix -ion was added in Middle English to form a noun indicating the action or result of the verb. The morpheme trus (from trudere) evolved into modern English words like "thrust" and "extrude," retaining the core idea of forceful movement. The word's development reflects a logical progression from physical forcing (e.g., geological intrusion) to abstract violations (e.g., privacy intrusion).
The intrusion of sunlight through the curtains woke her up.
The magma's intrusion formed a new layer of igneous rock.
Cybersecurity measures prevent unauthorized intrusion into sensitive databases.
His sudden intrusion into the meeting disrupted the discussion.
The noise from the street was an unwelcome intrusion into her quiet evening.