Толковый словарь английского языка Oxford English Reference - efficiency
Efficiency
efficiency
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)
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1.
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 ...Толковый словарь английского языка
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