Intrusion
Part of speech: noun
Definition: The forcible inclusion or entry of an external group or individual; the act of intruding.
Example sentence: I am very averse to bringing myself forward in print, but as my account will only appear as an appendage to a former production, and as it will be confined to such topics as have connection with my authorship alone, I can hardly accuse myself of a personal intrusion.
Encroachment
Part of speech: noun
Definition: An entry into a place or area that was previously uncommon; an advance beyond former borders; intrusion; incursion.An intrusion upon another's possessions or rights; infringement.That which is gained by such unlawful intrusion.An unlawful diminution of the possessions of another.