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.
Lilly's shot is the gold standard in terms of efficacy, Skovronsky said.—Angelica Peebles, CNBC, 12 Sep. 2025 Larger trials are needed to confirm the efficacy of azelastine against COVID-19 and to explore the medication’s potential benefits against other respiratory illnesses across more diverse populations and settings, Meiser says.—Tom Gavin, EverydayHealth.com, 11 Sep. 2025 With four generations in the workplace, understanding the efficacy and differences of communication styles is a must for any leader and a critical component of their leadership style.—Kathryn Lancioni, Forbes.com, 11 Sep. 2025 Those with chronic pain reported significantly higher levels of perfectionism and lower levels of self-compassion and self-efficacy than the pain-free group.—New Atlas, 10 Sep. 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