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efficacy

   Also found in: Dictionary/thesaurus, Medical, Legal, Wikipedia 0.01 sec.
luminous efficacy
The ratio of the total emitted luminous flux, in lumens, to the total electric power consumption in watts.
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They are not found to be such on the injustice and violence of individuals, and lose their efficacy in proportion to the number combined together, that is, in proportion as their efficacy becomes needful.
Federalist Papers Authored by James Madison by Madison, James View in context
A sacred rite of such efficacy that he who finds himself
The Devil's Dictionary by Bierce, Ambrose View in context
Like most savages they are firm believers in dreams, and in the power and efficacy of charms and amulets, or medicines as they term them.
The Adventures of Captain Bonneville, U.S.A., in the Rocky Mountains and the far West by Irving, Washington View in context
 
 
 
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