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Noun: efficiency  i'fishunsee
  1. The ratio of the output to the input of any system
     
  2. Skilfulness in avoiding wasted time and effort
    "she did the work with great efficiency"

Derived forms: efficiencies

See also: efficient

Type of: ratio, skilfulness [Brit, Cdn], skillfulness [N. Amer]

Antonym: inefficiency

Encyclopedia: Efficiency Efficiency, plant