In the planner's view, Rumsfeld had two goals: to demonstrate the efficacy of precision bombing and to "do the war on the cheap."—Seymour M. Hersh, New Yorker, 7 Apr. 2003Vaccines exist, but their efficacy against aerosolized plague is unknown.—Sharon Begley et al., Newsweek, 8 Oct. 2001… efficacy does not have to be demonstrated before homeopathic products are marketed.—Alison Abbott et al., Nature, 26 Sept. 1996
questioned the efficacy of the alarms in actually preventing auto theft
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Compounded drugs are not reviewed for safety and efficacy by the FDA.—Anjeanette Damon, ProPublica, 30 July 2025 Children: There is a lack of research on the safety and efficacy of this treatment in children.—Anna Giorgi, Verywell Health, 29 July 2025 Some aid organizations have also publicly expressed concerns about the efficacy and safety of airdrops.—Shannon K. Kingston, ABC News, 28 July 2025 In a recent 72-week clinical trial published in The New England Journal of Medicine, researchers compared the safety and efficacy of tirzepatide (Zepbound) and semaglutide (Wegovy).—Melissa Rudy, FOXNews.com, 28 July 2025 See All Example Sentences for efficacy
Word History
Etymology
borrowed from Latin efficācia, from efficāc-, efficāx "capable of fulfilling a function, efficacious" + -ia-y entry 2
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