Noun

• S: (n) invasion, encroachment, intrusion (any entry into an area not previously occupied) "an invasion of tourists"; "an invasion of locusts"
• S: (n) intrusion (entrance by force or without permission or welcome)
• S: (n) intrusion (the forcing of molten rock into fissures or between strata of an earlier rock formation)
• S: (n) intrusion (rock produced by an intrusive process)
• S: (n) trespass, encroachment, violation, intrusion, usurpation (entry to another's property without right or permission)