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Толковый словарь английского языка - efficiency

 

Efficiency

efficiency
noun (plural -cies) Date: 1633 the quality or degree of being efficient, 2. efficient operation, b. effective operation as measured by a comparison of production with cost (as in energy, time, and money), the ratio of the useful energy delivered by a dynamic system to the energy supplied to it, ~ apartment
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1.
  n. (pl. -ies) 1 the state or quality of being efficient. 2 Mech. & Physics the ratio of useful work performed to the total energy expended or heat taken in. Phrases and idioms efficiency bar a point on a salary scale requiring evidence of efficiency for further promotion. Etymology: L efficientia (as EFFICIENT) ...
Толковый словарь английского языка Oxford English Reference

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