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noun, plural ef·fi·ca·cies. capacity for producing a desired result or effect; effectiveness: a remedy of great efficacy. Origin of efficacy.
Efficacy definition is - the power to produce an effect. How to use efficacy in a sentence.
efficacy - capacity or power to produce a desired effect; "concern about the safety and efficacy of the vaccine". efficaciousness. effectiveness, effectivity, effectuality, effectualness - power to be effective; the quality of being able to bring about an effect. inefficaciousness, inefficacy - a lack of efficacy.
efficacy definition: 1. the ability, especially of a medicine or a method of achieving something, to produce the…. Learn more.
efficacy An index of the potency of a drug or disease treatment; for a vaccine, efficacy is the percentage of persons who are protected by the vaccine ef·fi·ca·cy
Dictionary entry overview: What does efficacy mean? • EFFICACY (noun) The noun EFFICACY has 1 sense: 1. capacity or power to produce a desired effect Familiarity information: EFFICACY used as a noun is very rare.