• The extent to which time is well used for the intended task.

    "The efficiency of the planning department is deplorable."

  • (United States) A one-room apartment.

    "I have an efficiency available June through July."

  • The extent to which a resource, such as electricity, is used for the intended purpose; the ratio of useful work to energy expended.

    "The efficiency of this loudspeaker is 40%."

  • (dated) The quality of producing an effect or effects.
  • (United States) A one-room apartment.

    "fully-furnished efficiencies"

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