efficacy
/EF-ih-kuh-see/nounthe ability to produce a desired result
“The trial measures the vaccine's efficacy over two years.”
- Synonyms
- effectiveness, potency, success
- Antonyms
- ineffectiveness
- Memory hook
- efficax: force that finishes the job.
Learn efficacy and 1,000+ GRE words with spaced repetition and an AI tutor.
Start learning free