What is the meaning of Intrusion?

The forcible inclusion or entry of an external group or individual; the act of intruding.

Magma forced into other rock formations; the rock formed when such magma solidifies.

A structure that lies within a historic district but is nonhistoric and irrelevant to the district.

The insertion of a phoneme into the pronunciation of a word despite its absence from the spelling. (e.g. intrusive r)

intrusion

Source: wiktionary.org