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From Biology-Online Dictionary | Biology-Online Dictionary
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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)

2. (Science: mechanics) The ratio of useful work to energy expended. Efficiency of a heat engine, the ratio of the work done an engine, to the work due to the heat supplied to it.

Origin: L. Efficientia.