infiltration

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.