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Exfiltration, an antonym for infiltration, may stand for:

  • The same as extraction (military) (also exfil)
  • A method for managing stormwater runoff
  • An air escape from a building, see ventilation (architecture)
  • Used by some computer security practitioners in place of 'data theft', to mean an unauthorized release of data from within a computer system or network (data or files extracted from borders of a computer operations center [Source: OPM director Katherine Archuleta testimony]).