What does efficiency mean?

Looking for the meaning or definition of the word efficiency? Here's what it means.

Noun The extent to which time is well used for the intended task. (dated) The quality of producing an effect or effects. The extent to which a resource, such as electricity, is used for the intended purpose; the ratio of useful work to energy expended. (United States) A one-room apartment. Find more words! 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For starters, we could increase the fuel efficiency of our cars and light trucks to 40 miles per gallon. These living roofs improve the energy efficiency of the building below, promote healthier air and enhance the appearance of urban roofscapes. The lack of a break after a long year's tedious work will reduce the efficiency of teachers. He may not accept Visa or Mastercard, but his service and efficiency is priceless. The binding efficiency index comes out to just under 12, which is nothing to get revved up about. See Also What is another word for efficiency? What is the opposite of efficiency? Sentences with the word efficiency Words that rhyme with efficiency What is the plural of efficiency? What is the adverb for efficiency? What is the adjective for efficiency? What is the noun for efficiency? Translations for efficiency Nearby Definitions efficiencies efficience efficacy efficacity efficacities efficaciousness efficiency apartment efficiency apartments efficient efficient cause efficient causes efficiently 10-letter Words Starting With e ef eff effi effic effici efficie efficien efficienc