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TOEFL BNC: 9115 COCA: 6281

efficacy

noun
/ˈefɪkəsi/
/ˈefɪkəsi/
[uncountable] (formal)
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  1. the ability of something to produce the results that are wanted功效;效验;效力 synonym effectiveness
    • to evaluate the efficacy and safety of the treatment评估治疗的有效性和安全性
    Word Originearly 16th cent.: from Latin efficacia, from efficax, efficac-, from efficere ‘accomplish’, from ex- ‘out, thoroughly’ + facere ‘do, make’.

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