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Verb: infiltrate  in'fil,treyt or 'in-fil,treyt [N. Amer], 'in-fil,treyt [Brit]
  1. Cause (a liquid) to enter by penetrating the interstices
  2. Enter a group or organization in order to spy on the members
    "The student organization was infiltrated by a traitor";
    - penetrate
  3. Pass into or through by filtering or permeating
    "the substance infiltrated the material"
  4. Pass through an enemy line; in a military conflict
    - pass through

Derived forms: infiltrated, infiltrates, infiltrating

Type of: fall in, filter, get together, join, pass, percolate, permeate, sink in

Encyclopedia: Infiltrate