(?), n. [L. efficacia, fr. efficax. See Efficacious.] Power to produce effects; operation or energy of an agent or force; production of the effect intended; as, the efficacy of medicine in counteracting disease; the efficacy of prayer. "Of noxious efficacy." Milton.
Syn. -- efficacy.
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Syn. -- Virtue; force; energy; potency; efficiency.
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(f*fsh"n*s), } n. [L. efficientia.] 1. The quality of being efficient or producing an effect or effects; efficient power; effectual agency.
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The manner of this divine efficiency being far above us.
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2. (Mech.) The ratio of useful work to energy expended. Rankine.
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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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