01 n. The quality of being efficient or producing an effect or effects; efficient power; effectual agency.
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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.
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2.
The ratio of useful work to energy expended.(Mech.)
Phrases & compounds
efficiency of a heat engine —
the ratio of the work done by an engine, to the work due to the heat supplied to it.