Link Centre Dictionary

efficacy

ef·fi·cacy

UK/ˈef.ə.kə.si/ US/ˈɛf.ɪ.kə.si/ rare

noun

1.

capacity or power to produce a desired effect

  • “concern about the safety and efficacy of the vaccine”
Synonyms
Antonyms

Origin

From Old French efficace, from Late Latin efficācia (“efficacy”) (whence -acy), from efficāx (“efficacious”); see efficacious.

Related words

Broader terms

WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.