9 letters · 9 points in Scrabble
noun any entry into an area not previously occupied
noun entrance by force or without permission or welcome
noun the forcing of molten rock into fissures or between strata of an earlier rock formation
originFrom Middle English intrusioun, from Old French intrusion, from Medieval Latin intrūsiō, from intrūdō, from Latin in- + trūdō.
Etymology from Wiktionary, CC BY-SA 3.0