ef·fi·cience ef·fi·cien·cy n.
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.
efficiency of a heat engine, the ratio of the work done by an engine, to the work due to the heat supplied to it.
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