efficience

ef`fi´cience

(ĕf`fĭsh´ens)

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.

(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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