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
Layer on the fact that Lilly, with its superior efficacy, is a leader in this obesity treatment race.
—
Trefis Team, Forbes.com, 3 June 2025
Medical marijuana, especially cannabinoids like THC (tetrahydrocannabinol) and CBD (cannabidiol), has shown efficacy in reducing pain.
—Tribune Content Agency, Mercury News, 2 June 2025
Instead, the brand focuses on skin care education, ingredient education, and ASMR-style sensorial content that showcases product textures beyond just efficacy claims.
—Ritu Upadhyay, Footwear News, 2 June 2025
Despite decades of data proving its efficacy at protecting teeth from decay—particularly children's teeth—two states have now banned the use of fluoride in public water, and communities around the country have followed suit or are considering doing the same.
—Beth Mole, ArsTechnica, 30 May 2025
See All Example Sentences for efficacy
Trefis Team, Forbes.com, 3 June 2025
Medical marijuana, especially cannabinoids like THC (tetrahydrocannabinol) and CBD (cannabidiol), has shown efficacy in reducing pain.
—Tribune Content Agency, Mercury News, 2 June 2025
Instead, the brand focuses on skin care education, ingredient education, and ASMR-style sensorial content that showcases product textures beyond just efficacy claims.
—Ritu Upadhyay, Footwear News, 2 June 2025
Despite decades of data proving its efficacy at protecting teeth from decay—particularly children's teeth—two states have now banned the use of fluoride in public water, and communities around the country have followed suit or are considering doing the same.
—Beth Mole, ArsTechnica, 30 May 2025
See All Example Sentences for efficacy
Recent Examples of Synonyms for efficacy
efficiency
Noun
-
The commission said the decision is meant to enhance player engagement, improve services and protect both efficiency and data security.—
James Powel,
USA Today,
14 June 2025
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At its core, this shift reframes bioenergetics as leadership currency: a founder's ability to perform under pressure, think clearly and lead with emotional resilience is directly tied to cellular efficiency.—
Ximena Araya-Fischel,
Forbes.com,
14 June 2025
Cite this Entry
“Efficacy.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/efficacy. Accessed 19 Jun. 2025.
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