as in effectiveness
the power to produce a desired result
questioned the efficacy of the alarms in actually preventing auto theft
Synonyms & Similar Words
Relevance
Antonyms & Near Antonyms
Example Sentences
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Recent Examples of efficacy
Separately, Reuters reported that scientists at the FDA who work on reviewing the safety and efficacy of medical devices and tobacco products are struggling to meet deadlines, with double their previous workload after recent job cuts.
—
Paul Du Quenoy, MSNBC Newsweek, 27 Mar. 2025
To recommend the right drug for you or your loved one, a neurologist will determine whether the disease is in a mild, moderate, or severe stage and evaluate each treatment’s potential efficacy and safety risks based on symptoms and medical history.
—Alisa Hrustic, SELF, 24 Mar. 2025
The filing discusses the company's strategy to periodically introduce new monoclonal antibody candidates as the virus evolves, aiming to maintain efficacy against new variants.
—Quartz Intelligence Newsroom, Quartz, 20 Mar. 2025
Without evidence, influencers at Children’s Health Defense and beyond have reframed the tragedy of the girl’s death as proof — of the efficacy of unproven cures like vitamin A, of maltreatment by a hospital and even of a plot to undermine Kennedy at the Department of Health and Human Services.
—Brandy Zadrozny, NBC News, 20 Mar. 2025
See All Example Sentences for efficacy
Paul Du Quenoy, MSNBC Newsweek, 27 Mar. 2025
To recommend the right drug for you or your loved one, a neurologist will determine whether the disease is in a mild, moderate, or severe stage and evaluate each treatment’s potential efficacy and safety risks based on symptoms and medical history.
—Alisa Hrustic, SELF, 24 Mar. 2025
The filing discusses the company's strategy to periodically introduce new monoclonal antibody candidates as the virus evolves, aiming to maintain efficacy against new variants.
—Quartz Intelligence Newsroom, Quartz, 20 Mar. 2025
Without evidence, influencers at Children’s Health Defense and beyond have reframed the tragedy of the girl’s death as proof — of the efficacy of unproven cures like vitamin A, of maltreatment by a hospital and even of a plot to undermine Kennedy at the Department of Health and Human Services.
—Brandy Zadrozny, NBC News, 20 Mar. 2025
See All Example Sentences for efficacy
Cite this Entry
“Efficacy.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/efficacy. Accessed 15 Apr. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share