as in effectiveness
the power to produce a desired result
questioned the efficacy of the alarms in actually preventing auto theft
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Recent Examples of efficacy
Testers consider performance across four primary categories: efficacy, safety (including ease of use), research and the science behind specific claims, as well as product value.
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Jenny Berg, Allure, 27 Nov. 2024
By requiring Big Pharma to subject any vaccine to rigorous study and proof of safety and efficacy before going to the mass market?
—Sun Sentinel Editorial Board, Sun Sentinel, 24 Nov. 2024
The Silicon Valley investor has been critical of the FDA, once calling in a speech for the agency to approve drugs based only on safety concerns and to later determine the drugs' efficacy.
—Dan Diamond The Washington Post, arkansasonline.com, 26 Nov. 2024
The aim is to better understand disease development and treatment efficacy, which could have a profound impact on the medical world.
—New Atlas, 24 Nov. 2024
See all Example Sentences for efficacy 
Jenny Berg, Allure, 27 Nov. 2024
By requiring Big Pharma to subject any vaccine to rigorous study and proof of safety and efficacy before going to the mass market?
—Sun Sentinel Editorial Board, Sun Sentinel, 24 Nov. 2024
The Silicon Valley investor has been critical of the FDA, once calling in a speech for the agency to approve drugs based only on safety concerns and to later determine the drugs' efficacy.
—Dan Diamond The Washington Post, arkansasonline.com, 26 Nov. 2024
The aim is to better understand disease development and treatment efficacy, which could have a profound impact on the medical world.
—New Atlas, 24 Nov. 2024
See all Example Sentences for efficacy
Thesaurus Entries Near efficacy
Cite this Entry
“Efficacy.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/efficacy. Accessed 22 Dec. 2024.
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