Examples of efficacy in a Sentence
In the planner's view, Rumsfeld had two goals: to demonstrate the efficacy of precision bombing and to "do the war on the cheap."
—
Seymour M. Hersh, New Yorker, 7 Apr. 2003
Vaccines exist, but their efficacy against aerosolized plague is unknown.
—Sharon Begley et al., Newsweek, 8 Oct. 2001
… efficacy does not have to be demonstrated before homeopathic products are marketed.
—Alison Abbott et al., Nature, 26 Sept. 1996
questioned the efficacy of the alarms in actually preventing auto theft
Seymour M. Hersh, New Yorker, 7 Apr. 2003
Vaccines exist, but their efficacy against aerosolized plague is unknown.
—Sharon Begley et al., Newsweek, 8 Oct. 2001
… efficacy does not have to be demonstrated before homeopathic products are marketed.
—Alison Abbott et al., Nature, 26 Sept. 1996
questioned the efficacy of the alarms in actually preventing auto theft
Recent Examples on the Web
Real-time, auditable settlement reduces operational and counterparty risk and can even enhance sanctions efficacy by making flows more traceable.
—Chris Maurice, Fortune, 3 Oct. 2025
The findings on the effect of treatment duration and age on berberine efficacy are conflicting.
—Trang Tran, Verywell Health, 30 Sep. 2025
This would forego the need for a larger phase 3 study, though other trials may be done to confirm the treatment’s efficacy.
—Allison Parshall, Scientific American, 30 Sep. 2025
Named after the island’s Indigenous name, Rapa Nui, the drug rapamycin was initially developed as an immunosuppressant to prevent organ transplant rejection and to improve the efficacy of stents to treat coronary artery disease.
—Ted Powers, The Conversation, 29 Sep. 2025
See All Example Sentences for efficacy
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Chris Maurice, Fortune, 3 Oct. 2025
The findings on the effect of treatment duration and age on berberine efficacy are conflicting.
—Trang Tran, Verywell Health, 30 Sep. 2025
This would forego the need for a larger phase 3 study, though other trials may be done to confirm the treatment’s efficacy.
—Allison Parshall, Scientific American, 30 Sep. 2025
Named after the island’s Indigenous name, Rapa Nui, the drug rapamycin was initially developed as an immunosuppressant to prevent organ transplant rejection and to improve the efficacy of stents to treat coronary artery disease.
—Ted Powers, The Conversation, 29 Sep. 2025
See All Example Sentences for efficacy
Cite this Entry
“Efficacy.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/efficacy. Accessed 7 Oct. 2025.
Copy CitationKids Definition
efficacy
noun
ef·fi·ca·cy
ˈef-i-kə-sē 
plural efficacies
: the power to produce a desired result
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