infiltration
secret entry / seepage / penetration
Noun
This term describes a slow, stealthy, or gradual penetration. In a social or political context, it carries a strong connotation of secrecy and deception, often implying a subversive intent to undermine an organization from within. In scientific or medical contexts, the word describes a physical process of seepage. It is used to describe how water enters soil or how fluids move through biological tissues, focusing on the permeability of the medium rather than intent.
Meanings
Noun
The process of secretly entering a place or organization to gather information or cause damage.
"The intelligence agency was accused of infiltration of the rebel group."