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efficacy
[ ef-i-kuh-see ]
noun
- the capacity for producing a desired result or effect:
Short, frequent periods of practice were shown to have greater efficacy than longer and less frequent ones.
- a measure of the success of a vaccine or other pharmaceutical when used in the controlled environment of a clinical trial, as opposed to in the real world. Compare effectiveness ( def 3 ).
efficacy
/ ˈɛfɪkəsɪ /
noun
- the quality of being successful in producing an intended result; effectiveness
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Other Words From
- non·ef·fi·ca·cy noun
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Word History and Origins
Origin of efficacy1
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Example Sentences
The eating disorder field remains divided over the potential efficacy of such measures.
On average, the vaccine has an efficacy of about 60 percent.
The efficacy of bandying threats of going to hell met its match in the Civil War.
If there were a pill with such poor efficacy, it might be considered malpractice to prescribe it.
Most Pennsylvanians now support a moratorium on capital punishment until its efficacy can be determined.
The cow happily recovered, which the widow entirely attributed to the efficacy of her pastor's prayer.
It is, therefore, with pleasure I make known the following recipe, which I am assured has been tried with efficacy.
Who can understand its nature, its operations, the sufficiency which is not sufficient, and the efficacy which is ineffectual.
The natural reverence for their remains soon passed into a superstitious veneration and belief in their miraculous efficacy.
As such, the efficacy of prayer in their regard must be judged according to the principles applying to the latter.
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