efficacy
/ˈɛf.ɪ.kə.si/ noun
Forms efficacies
- noun The ability to produce a desired effect under ideal testing conditions.
- noun A degree of ability to produce a desired effect; effectiveness.
Synonyms
Antonyms
Etymology
From Old French efficace, from Late Latin efficācia (“efficacy”) (whence -acy), from efficāx (“efficacious”); see efficacious.
Webster’s 1913
- noun Power to produce effects; operation or energy of an agent or force; production of the effect intended; as, the efficacy of medicine in counteracting disease; the efficacy of prayer. "Of noxious efficacy." Milton.
Etymology [L. efficacia, fr. efficax. See Efficacious.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “efficacy”, CC BY-SA 4.0. Details