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efficacy

   Also found in: Medical, Wikipedia 0.31 sec.
ef·fi·ca·cy  (f-k-s)
n.
Power or capacity to produce a desired effect; effectiveness.
[Latin efficcia, from efficx, efficc-, efficacious; see efficacious.]
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.efficacy - capacity or power to produce a desired effect; "concern about the safety and efficacy of the vaccine"
efficaciousness
effectiveness, effectivity, effectuality, effectualness - power to be effective; the quality of being able to bring about an effect
inefficaciousness, inefficacy - a lack of efficacy
efficacy
noun effectiveness, efficiency, power, value, success, strength, virtue, vigour, use, usefulness, potency, fruitfulness, productiveness, efficaciousness
Translations
Spanish efficacy [ˈɛfɪkəsɪ] n → eficacia
French efficacy [ˈɛfɪkəsɪ] n → efficacité f
German efficacy [ˈɛfɪkəsɪ] n → Wirksamkeit f
Italian efficacy [ˈɛfɪkəsɪ] n → efficacia
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? Mentioned in ? References in classic literature
 
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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