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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.

Ideaya Biosciences surged 13% after the biotechnology company released positive, statistically significant results from a clinical trial evaluating the efficacy of a combination therapy in patients with a rare form of eye cancer.

From Barron's • Apr. 13, 2026

What they do need are mechanisms for collective decision-making for maximum efficacy — identifying people the movement trusts “to sit at the table” and deliver a better outcome.

From Salon • Apr. 4, 2026

Next-gen biologic technologies such as antibody-drug conjugates and bispecific antibodies are expected to expand quickly due to higher efficacy and less toxicity, according to Bernstein.

From The Wall Street Journal • Apr. 1, 2026

“The risk is that constant flip-flopping and headline fatigue is starting to seriously undermine the efficacy of the ‘Trump put,’” Barclays analysts said in an equity research note Friday.

From MarketWatch • Mar. 27, 2026

That’s the kind of fatalism and pessimism typical of a repressive feudal system, where peasants have no reason to believe in the efficacy of their own work.

From "Outliers" by Malcolm Gladwell




Vocabulary lists containing efficacy