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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
Doctors also advise against this, noting episodic usage is not only dangerous but also will reduce the efficacy should the user need the drug in the future.
—Emily Burns, WWD, 7 Jan. 2025
However, critics question the efficacy of these measures.
—Kevin Lynn, Newsweek, 6 Jan. 2025
For example, the Digital Services Act in the European Union requires gaming companies who operate there to submit public-facing transparency reports about online harms within their spaces and the efficacy of their tools to combat them.
—Rachel Kowert, WIRED, 5 Jan. 2025
In addition to following Johnson’s medical treatment, Don’t Die compiles interviews with journalists, researchers, and doctors in the longevity field, all of whom have varying opinions about the efficacy of Johnson’s mission.
—Ct Jones, Rolling Stone, 3 Jan. 2025
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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 14 Jan. 2025.
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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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