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efficience

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ef`fi´cience    (ĕf`fĭsh´ens)
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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