definition of
intrusion

[1] #1 intrusion n. [invasion, encroachment] any entry into an area not previously occupied; "an invasion of tourists"; "an invasion of locusts". wn

[2] #2 intrusion n. entrance by force or without permission or welcome. wn

[3] #3 intrusion n. the forcing of molten rock into fissures or between strata of an earlier rock formation. wn

[4] #4 intrusion n. rock produced by an intrusive process. wn

[5] #5 intrusion n. [trespass, encroachment, violation, usurpation] entry to another's property without right or permission. wn