Bible Dictionaries
Efficacy
Webster's Dictionary
(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.
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Bibliography Information
Webster, Noah. Entry for 'Efficacy'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/e/efficacy.html. 1828.