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Definitions

efficacy

[ef-i-kuh-see] / ˈɛf ɪ kə si /


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Leaving efficacy to doctors would help Americans lead longer, healthier lives.

From The Wall Street Journal • Jun. 1, 2026

They add: "Assessing long-term efficacy is critical since those who work night shifts for many years would need to consistently consume melatonin supplements over that time frame to maximize the potential cancer prevention benefits."

From Science Daily • May 30, 2026

Brain-imaging studies offer a possible explanation for EMDR’s efficacy.

From The Wall Street Journal • May 26, 2026

China’s Sichuan Kelun-Biotech Biopharmaceutical, a Merck partner, reported positive results for a late-stage trial evaluating the efficacy of sacituzumab tirumotecan, or sac-TMT.

From Barron's • May 22, 2026

In the 1960s and 1970s Francis L. Black, a virologist at Yale, conducted safety and efficacy tests among South American Indians of a new, improved measles vaccine.

From "1491" by Charles C. Mann




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