efficacy
/ˈefɪkəsɪ/noun
mass noun
- formal the ability to produce a desired or intended result〈正式〉功效; 效力; 效能:
there is little information on the efficacy of this treatment.
有关这种疗法的疗效目前所知甚少。
词源
early 16th cent.: from Latin efficacia, from efficax, efficac (see EFFICACIOUS).