- 1. n. 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. Source: opted
- 2. n. capacity or power to produce a desired effect Source: wordnet
- 3. 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. -- Virtue; force; energy; potency; efficiency. Source: webster
- 4. Power to produce effects; operation or energy of an agent orforce; production of the effect intended; as, the efficacy ofmedicine in counteracting disease; the efficacy of prayer. "Ofnoxious efficacy." Milton. Source: adambom
- 5. n:100 n. capacity or power to produce a desired effect Source: ecdict
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effectpowerproduceenergyagentcounteractingdiseaseeffectsforceintendedoperationprayerproductioncapacitydesiredmedicinemiltonefficiencynoxiouspotencyvirtue