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
Each model was tested several times in different weather conditions, and in different parts of the yard, to assess its efficacy, ease of use, and overall performance.
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Kat De Naoum, Better Homes & Gardens, 31 Oct. 2024
Regardless of the efficacy of these non-core businesses, the typical risk-averse investors that have been historically attracted to companies like Air Products are going to flee when the risk profile changes.
—Kenneth Squire, CNBC, 19 Oct. 2024
More research and trials are needed to prove the efficacy of this procedure.19
Does Insurance Cover Stem Cell Injections for Knee Pain?
—Alex Yampolsky, Verywell Health, 17 Oct. 2024
Some variations are also showing very good efficacy on pests including the Varroa destructor mite which continues to plague the commercial honeybee industry.
—Steven Savage, Forbes, 22 Oct. 2024
See all Example Sentences for efficacy 
Kat De Naoum, Better Homes & Gardens, 31 Oct. 2024
Regardless of the efficacy of these non-core businesses, the typical risk-averse investors that have been historically attracted to companies like Air Products are going to flee when the risk profile changes.
—Kenneth Squire, CNBC, 19 Oct. 2024
More research and trials are needed to prove the efficacy of this procedure.19
Does Insurance Cover Stem Cell Injections for Knee Pain?
—Alex Yampolsky, Verywell Health, 17 Oct. 2024
Some variations are also showing very good efficacy on pests including the Varroa destructor mite which continues to plague the commercial honeybee industry.
—Steven Savage, Forbes, 22 Oct. 2024
See all Example Sentences for efficacy
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Cite this Entry
“Efficacy.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/efficacy. Accessed 22 Nov. 2024.
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