Origin: Latin suffix -sion
Intrusion has 6 different meanings across 1 category:
any entry into an area not previously occupied
"an invasion of tourists"
"an invasion of locusts"
entrance by force or without permission or welcome
"The security guard immediately confronted the stranger's intrusion into the private garden."
the forcing of molten rock into fissures or between strata of an earlier rock formation
"The geologist identified a classic intrusion where ancient magma forced its way up through cracks in the surrounding sedimentary layers."
rock produced by an intrusive process
"The geologist identified the granite pluton as a classic example of intrusion, where magma forced its way into surrounding rock before cooling and solidifying."
entry to another's property without right or permission
"The security guard arrested the trespasser for unauthorized intrusion onto the private estate."
The forcible inclusion or entry of an external group or individual; the act of intruding.
"The sudden intrusion of the construction crew disrupted our morning routine before we could even finish breakfast."
In plain English: Intrusion is when someone enters a place without being invited and disturbs people who are there.
"The sudden intrusion of a loud construction crew ruined our quiet afternoon nap."
Usage: Use intrusion to describe unwanted physical entry, such as strangers breaking into a home, rather than abstract interference in affairs. It specifically implies a forceful violation of boundaries where someone enters without permission.
The word entered English via the path of Middle and Old French before arriving from its root in Medieval Latin. Originally meaning a pushing or thrusting into something, it now describes an unwanted entry.