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Noun: infiltrator  in'fil,trey-tu(r) or 'in-fil,trey-tu(r) [N. Amer], 'in-fil,trey-tu(r) [Brit]
  1. Someone who takes up a position surreptitiously for the purpose of espionage
     
  2. An intruder (as troops) with hostile intent

Derived forms: infiltrators

Type of: interloper, intruder, spy, trespasser, undercover agent

Encyclopedia: Infiltrator

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