Definition for EF'FI-CA-CY

EF'FI-CA-CY, n. [Sp. and It. efficacia; Fr. efficace; from L. efficax.]

Power to produce effects; production of the effect intended; as, the efficacy of the gospel in converting men from sin; the efficacy of prayer; the efficacy of medicine in counteracting disease; the efficacy of manure in fertilizing land.

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