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From Latin efficientia.


  • IPA(key): /ɪˈfɪʃn̩si/
  • (file)


efficiency (countable and uncountable, plural efficiencies)

  1. The extent to which time is well used for the intended task.
    Antonyms: inefficiency, wastefulness
    The efficiency of the planning department is deplorable.
    • 2012 September 7, Phil McNulty, “Moldova 0-5 England”, in BBC Sport[1]:
      The display and result must be placed in the context that was it was against a side that looked every bit their Fifa world ranking of 141 - but England completed the job with efficiency to record their biggest away win in 19 years.
  2. (dated) The quality of producing an effect or effects.
  3. The extent to which a resource is used for the intended purpose; the ratio of useful work to energy expended.
    Antonyms: inefficiency, wastefulness
    The efficiency of this loudspeaker is 40%.
  4. (US) A one-room apartment.
    Synonyms: efficiency apartment, (UK, Ireland) bedsit
    I have an efficiency available June through July.
    fully-furnished efficiencies


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The translations below need to be checked and inserted above into the appropriate translation tables, removing any numbers. Numbers do not necessarily match those in definitions. See instructions at Wiktionary:Entry layout § Translations.