Etymology
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intrusion (n.)

late 14c., "unjust invasion of property or usurpation of office," from Old French intrusion (14c.), from Medieval Latin intrusionem (nominative intrusio) "a thrusting in," noun of action from past participle stem of Latin intrudere "to thrust in, force in," from in- "in" (from PIE root *en "in") + trudere "to thrust, push," from PIE *treud- "to press, push, squeeze" (see threat).

Meaning "a thrusting or pushing in" is from 1590s; that of "act of intruding" is from 1630s. Geological sense is from 1816.

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Definitions of intrusion

intrusion (n.)
any entry into an area not previously occupied;
Synonyms: invasion / encroachment
intrusion (n.)
entrance by force or without permission or welcome;
intrusion (n.)
the forcing of molten rock into fissures or between strata of an earlier rock formation;
intrusion (n.)
rock produced by an intrusive process;
intrusion (n.)
entry to another's property without right or permission;
From wordnet.princeton.edu