Ef*fi"cience\, Efficiency \Ef*fi"cien*cy\, 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 an engine, to the work due to the heat supplied to it.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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