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Word of the Day Tuesday, June 9, 2026

efficacy

/ɪˈfɪsəsi/ noun · British & US
Valid in UKValid in US
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What does efficacy mean?

noun

The quality or state of being effective; the extent to which something is successful in producing a desired result. The ability or power to produce a desired or intended result.

Example

"The new medication had a high efficacy in treating the disease, with a success rate of over 90%."

Definition generated by AI and curated by RJS Tech Solutions LLP.

Synonyms for efficacy

Antonyms of efficacy

Rhymes with efficacy

Etymologically related