efficacy

Definition of efficacy

ef´fi`ca`cy
n.1.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.

Related Words

effectiveness, effectivity, effectuality, effectualness, efficacious, efficaciousness, inefficacious, inefficaciousness, inefficacy
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