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. [ 1913 Webster ]
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. [ 1913 Webster ]
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