The act of secretly entering a physical location and/or organization.
The substance which has entered the pores or cavities of a body.
process by which water on the ground surface enters the soil.
The act or process of infiltrating, as of water into a porous substance, or of a fluid into the cells of an organ or part of the body.
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.