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(), Effi"ciency ()} n.[L. efficientia.] 1. The quality of being efficient or producing an effect or effects; efficient power; effectual agency. The manner of this divine efficiency being far above us. Hooker. 2. (Mech.) The ratio of useful work to energy expended. Rankine. Efficiency of a heat engine, the ratio of the work done by an engine, to the work due to the heat supplied to it. スポンサード リンク
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