EF'FICACY, noun [Latin efficax.] Power to produce effects; production to 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.
Content
Rights and sources
Review source, license and attribution information for this content.
Content
Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.