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efficacy noun [ ˈɛfɪkəsi ]

• the ability to produce a desired or intended result.
• "there is little information on the efficacy of this treatment"
Similar: effectiveness, success, successfulness, productiveness, fruitfulness, potency, power, benefit, advantage, value, virtue, use, usefulness, effectuality, constructiveness,
Opposite: inefficacy,
Origin: early 16th century: from Latin efficacia, from efficax, efficac- (see efficacious).


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