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Synonyms
Examples of efficacy in a Sentence
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. 2003
Vaccines 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
The American Dental Association says that 70 years of research backs up the safety and efficacy of adding fluoride to water, a process known as community water fluoridation.
—Jake Piazza, CNBC, 3 Nov. 2024
The longstanding goal of Drs. Walpole and Richardson was to take this groundbreaking compound and test its efficacy on the people who needed it most.
—Katie Hafner, Scientific American, 31 Oct. 2024
Future studies should take these into account to confirm vitamin K2's efficacy as a treatment for the condition.
—New Atlas, 30 Oct. 2024
The data showed good safety, tolerability and efficacy.
—Joshua P. Cohen, Forbes, 3 Nov. 2024
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Word History
Etymology
borrowed from Latin efficācia, from efficāc-, efficāx "capable of fulfilling a function, efficacious" + -ia -y entry 2
First Known Use
1527, in the meaning defined above
Dictionary Entries Near efficacy
Cite this Entry
“Efficacy.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/efficacy. Accessed 29 Nov. 2024.
Kids Definition
More from Merriam-Webster on efficacy
Nglish: Translation of efficacy for Spanish Speakers
Britannica English: Translation of efficacy for Arabic Speakers
Britannica.com: Encyclopedia article about efficacy
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