infiltration

Noun
  1. A process in which individuals (or small groups) penetrate an area (especially the military penetration of enemy positions without detection) (synset 100978784)
    referred to in: armed forces, armed services, military, military machine, war machine - the military forces of a nation
    is a type of: incursion, penetration - an attack that penetrates into enemy territory
  2. The slow passage of a liquid through a filtering medium (synset 113555477)
    "the percolation of rainwater through the soil"; "the infiltration of seawater through the lava"
    is a type of: filtration - the process whereby fluids pass through a filter or a filtering medium
    same as: percolation

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