| 单词 | efficacy |
| 释义 | efficacy (once / 943 pages) n The degree to which a method or medicine brings about a specific result is its efficacy. You might not like to eat it, but you can't question the efficacy of broccoli as a health benefit. Efficacy is a more formal way to say effectiveness, both of which stem from the Latin verb efficere "to work out, accomplish." The effectiveness, or efficacy, of something is how well it works or brings the results you hoped for. A scientist does research to determine the efficacy of a vaccine or medicine under development. If it is efficacious, it will cure or prevent a disease. WORD FAMILYefficacy: efficacies, efficacious, inefficacy+/efficacious: efficaciously, efficaciousness, inefficacious/inefficacious: inefficaciously, inefficaciousness/inefficacy: inefficacies USAGE EXAMPLESLast month, the first efficacy study of an HIV vaccine in seven years was launched in South Africa. Wall Street Journal(Dec 29, 2016) Good data about the efficacy of A.I. therapists is scarce, since the technology is so young. The New Yorker(Dec 25, 2016) The vaccine showed 100 percent efficacy in protecting those who got it. Washington Post(Dec 22, 2016) n capacity or power to produce a desired effect concern about the safety and efficacy of the vaccine Syn|Ant|Hyper efficaciousness inefficaciousness, inefficacy a lack of efficacy effectiveness, effectivity, effectuality, effectualness power to be effective; the quality of being able to bring about an effect |
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