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 American Dental Association says that 70 years of research backs up the safety and efficacy of adding fluoride to water, a process known as community water fluoridation.
—
Jake Piazza, CNBC, 3 Nov. 2024
The longstanding goal of Drs. Walpole and Richardson was to take this groundbreaking compound and test its efficacy on the people who needed it most.
—Katie Hafner, Scientific American, 31 Oct. 2024
Future studies should take these into account to confirm vitamin K2's efficacy as a treatment for the condition.
—New Atlas, 30 Oct. 2024
The data showed good safety, tolerability and efficacy.
—Joshua P. Cohen, Forbes, 3 Nov. 2024
See all Example Sentences for efficacy 
Jake Piazza, CNBC, 3 Nov. 2024
The longstanding goal of Drs. Walpole and Richardson was to take this groundbreaking compound and test its efficacy on the people who needed it most.
—Katie Hafner, Scientific American, 31 Oct. 2024
Future studies should take these into account to confirm vitamin K2's efficacy as a treatment for the condition.
—New Atlas, 30 Oct. 2024
The data showed good safety, tolerability and efficacy.
—Joshua P. Cohen, Forbes, 3 Nov. 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 3 Dec. 2024.
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