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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.

"Some of the SPF testing, I feel, has become a bit more of a marketing exercise than a real reflection of efficacy," cosmetic chemist Michelle Wong told the BBC last year.

From BBC • Mar. 26, 2026

And questions remain around the efficacy of removal programs and credits.

From The Wall Street Journal • Mar. 26, 2026

ImmunityBio received an FDA warning for misrepresenting Anktiva’s efficacy and administration, violating federal law.

From Barron's • Mar. 24, 2026

Muscle growth and exploratory functional efficacy weren’t consistent nor robust enough to move the drug to late-stage development, the company said.

From The Wall Street Journal • Mar. 23, 2026

But there’ll always be some people who will do extremely well, and they will loudly swear to the efficacy of whatever system they’ve used.

From "Innumeracy: Mathematical Illiteracy and Its Consequences" by John Allen Paulos