Thesaurus.com
Dictionary.com
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.

The company reported positive results for two studies of its elecoglipron experimental drug, which showed competitive efficacy with a standard safety profile, the analysts say.

From The Wall Street Journal • Jun. 9, 2026

The analysts at Citi also highlighted what they said were real-world signals of waning efficacy in Wegovy pill as roughly a quarter to a third of patients are no longer losing weight.

From MarketWatch • Jun. 8, 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

Early data from China showed “robust efficacy signals,” Dai noted.

From Barron's • May 27, 2026

In this domain, the prize for efficacy goes to the Cantonese dialect of Chinese, whose brevity grants residents of Hong Kong a rocketing memory span of about 10 digits.

From "Outliers" by Malcolm Gladwell




Vocabulary lists containing efficacy


Vocabulary.com logo
by dictionary.com

Look it up. Learn it forever.

Remember "efficacy" for good with VocabTrainer. Expand your vocabulary effortlessly with personalized learning tools that adapt to your goals.

Take me to Vocabulary.com