American English

Definition of efficiency noun from the Oxford Advanced American Dictionary



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  1. 1[uncountable] the quality of doing something well with no waste of time or money improvements in efficiency at the factory I was impressed by the efficiency with which she handled the crisis.
  2. 2efficiencies [plural] ways of wasting less time and money or of saving time or money We are looking at our business to see where savings and efficiencies can be made.
  3. 3[uncountable] (technology) the relationship between the amount of energy that goes into a machine or an engine, and the amount that it produces
  4. 4[countable] = efficiency apartment
See the Oxford Advanced Learner's Dictionary entry: efficiency

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