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Noun: infiltration  ,in,fil'trey-shun or ,in-ful'trey-shun
  1. (military) a process in which individuals (or small groups) penetrate an area (especially the military penetration of enemy positions without detection)
     
  2. The slow passage of a liquid through a filtering medium
    "the infiltration of seawater through the lava";
    - percolation

Derived forms: infiltrations

Type of: filtration, incursion, penetration

Encyclopedia: Infiltration, The set trap