#1 intrusion n. [invasion, encroachment] any entry into an area not previously occupied; "an invasion of tourists"; "an invasion of locusts". wn
#2 intrusion n. entrance by force or without permission or welcome. wn
#3 intrusion n. the forcing of molten rock into fissures or between strata of an earlier rock formation. wn
#4 intrusion n. rock produced by an intrusive process. wn
#5 intrusion n. [trespass, encroachment, violation, usurpation] entry to another's property without right or permission. wn
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