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
Recent Examples on the WebWhen evaluating the efficacy of MDMA, the Psychopharmacologic Drugs Advisory Committee reviewed results from two randomized studies that were published in the journal Nature Medicine.—Solcyré Burga, TIME, 5 June 2024 There’s no question about its safety or its efficacy.—Michael Hiltzik, Los Angeles Times, 5 June 2024 Actives are anything that actually provide efficacy and nutrients.—Hedy Phillips, Peoplemag, 4 June 2024 Curve represents the interim cumulative incidence of clinical events, including the treatment efficacy, occurring over prespecified time in Study II.—Fort Worth Star-Telegram, 30 May 2024 See all Example Sentences for efficacy
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'efficacy.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Word History
Etymology
borrowed from Latin efficācia, from efficāc-, efficāx "capable of fulfilling a function, efficacious" + -ia-y entry 2
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