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
The big picture: Advocates for Atlanta's unsheltered population are calling on city officials to reconsider the safety, efficacy and humanity of encampment sweeps after the tragic death of Cornelius Taylor over the Martin Luther King Jr. Day holiday weekend.
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Thomas Wheatley, Axios, 24 Jan. 2025
In a statement sent to USA TODAY, a spokesperson for drug maker Novo Nordisk said the company welcomes any independent research investigating the safety and efficacy of their products, which include Ozempic for diabetes and Wegovy for weight loss.
—Adrianna Rodriguez, USA TODAY, 22 Jan. 2025
Herbal medicines may be inconsistent in strength and efficacy between batches and may not be suitable for use on sensitive skin.6
More research may be needed to help better understand the differences in psoriasis severity between Asian people and people of other ethnicities.
—Sayaka Blickenderfer, Phd, Health, 18 Jan. 2025
Its formula includes a glucose complex to boost the efficacy of retinol while improving skin’s tolerance.
—Christa Joanna Lee, Allure, 17 Jan. 2025
See all Example Sentences for efficacy 
Thomas Wheatley, Axios, 24 Jan. 2025
In a statement sent to USA TODAY, a spokesperson for drug maker Novo Nordisk said the company welcomes any independent research investigating the safety and efficacy of their products, which include Ozempic for diabetes and Wegovy for weight loss.
—Adrianna Rodriguez, USA TODAY, 22 Jan. 2025
Herbal medicines may be inconsistent in strength and efficacy between batches and may not be suitable for use on sensitive skin.6
More research may be needed to help better understand the differences in psoriasis severity between Asian people and people of other ethnicities.
—Sayaka Blickenderfer, Phd, Health, 18 Jan. 2025
Its formula includes a glucose complex to boost the efficacy of retinol while improving skin’s tolerance.
—Christa Joanna Lee, Allure, 17 Jan. 2025
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 6 Feb. 2025.
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