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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

The recommendation is based on Phase 3 trial data showing improvements in event-free survival, a crucial measure of efficacy.

From Barron's • May 22, 2026

“The clean safety profile, combined with best-in-class efficacy across all doses, makes this a clean win” for Lilly, according to RBC Capital Markets analyst Trung Huynh.

From MarketWatch • May 21, 2026

But questions about the painlessness and efficacy of lethal injection were emerging.

From "Just Mercy" by Bryan Stevenson




Vocabulary lists containing efficacy


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