An advance into enemy territory, an attempted invasion; an encroachment, an incursion.
Often followed by in, into, or on: initial progress made toward accomplishing a goal or solving a problem.
The forcible inclusion or entry of an external group or individual; the act of intruding.
The insertion of a phoneme into the pronunciation of a word despite its absence from the spelling. (e.g. intrusive r)
A structure that lies within a historic district but is nonhistoric and irrelevant to the district.
Magma forced into other rock formations; the rock formed when such magma solidifies.