INFILTRATION

infiltration

(noun) a process in which individuals (or small groups) penetrate an area (especially the military penetration of enemy positions without detection)

percolation, infiltration

(noun) the slow passage of a liquid through a filtering medium; “the percolation of rainwater through the soil”; “the infiltration of seawater through the lava”

Source: WordNet® 3.1

Etymology

Noun

infiltration (countable and uncountable, plural infiltrations)

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 substance which has entered the pores or cavities of a body.

The act of secretly entering a physical location and/or organization.

Source: Wiktionary

In`fil*tra"tion, n. Etym: [Cf. F. infiltration.]

1. The act or process of infiltrating, as if water into a porous substance, or of a fluid into the cells of an organ or part of the body.

2. The substance which has entered the pores or cavities of a body. Addison. Calcareous infiltrations filling the cavities. Kirwan. Fatty infiltration. (Med.) See under Fatty.

– Infiltration gallery, a filter gallery.

Source: Webster’s Unabridged Dictionary 1913 Edition