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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The report also probes the efficacy of podcast advertising.—William Earl, Variety, 19 Mar. 2025 Scholars from across the political spectrum and around the world have questioned the general efficacy of foreign assistance, arguing that these programs are designed to serve the interests of donors, not the needs or recipients.—Sarah Stroup, The Conversation, 19 Mar. 2025 This move undercuts a system that has long given Americans confidence in vaccine safety and efficacy, removing the very forums where seasoned scientists evaluate global surveillance data, manufacturing constraints and population needs in an open, accountable manner.—Richard Hughes Iv, Baltimore Sun, 19 Mar. 2025 Ultimately, however, more research is needed to determine the efficacy of apple cider vinegar for lowering blood pressure.—Yvelette Stines, Verywell Health, 18 Mar. 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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