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 Web
Examples are automatically compiled from online sources to
show current usage.Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
They are often intertwined with political, moral and spiritual ideas around the rights of an individual versus the community, the limits of government power over bodily autonomy, mistrust of medical institutions and misinformation about shot safety and efficacy.—Annika Kim Constantino, CNBC, 9 Mar. 2025 Like: Look for third-party certification seals on the label, which indicate the product has undergone an independent review of safety and efficacy; USP and NSF are popular ones.—Dylan Scott, Vox, 7 Mar. 2025 The safety and efficacy of weight loss gummies are generally unknown, and no evidence supports taking them.—Allison Herries, Verywell Health, 7 Mar. 2025 This includes ensuring that accurate information about vaccine safety and efficacy is disseminated.—Angelica Stabile, Fox News, 7 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
Share