intrusion

(noun) any entry into an area not previously occupied. Synonyms: invasion, encroachment. Examples: "An invasion of tourists." "An invasion of locusts."

(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.

(noun) rock produced by an intrusive process.

(noun) entry to another's property without right or permission. Synonyms: trespass, encroachment, violation, usurpation.