efficacy
English · Thesaurus
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efficacy
- /ˈɛf.ɪ.kə.si/ Canada, US, UK
- /ˈef.ɪ.kə.si/ Australia
- [ˈef.ɪ.kə.sɪi] Australia
- /ˈef.ə.kə.si/ New Zealand
Where it comes from
From Old French efficace, from Late Latin efficācia (“efficacy”) (whence -acy), from efficāx (“efficacious”); see efficacious.
noun efficacies
- The ability to produce a desired effect under ideal testing conditions. […]and this hath even made me ſuſpect the efficacy of reliques, to examine the bones, queſtion the habits and appurtenances of Saints, and even of Chriſt himſelf.
- A degree of ability to produce a desired effect; effectiveness. Toothbrush with improved efficacy
Similar: efficacity
Thesaurus
Closest in meaning: efficaciousness, efficacious, effective, effectiveness, usefulness, utility, efficiency, efficient, effect, adequacy, validity, success, performance, cost-effectiveness, potency, impact
noun
Similar: efficacity
Translations
Every language
noun ability to produce effect
| Español | eficacia |
|---|---|
| 日本語 | 有効性 yūkōsei |
| 中文 | 功效 gōngxiào, 效力 xiàolì, 效能 xiàonéng, 效驗 /效验 xiàoyàn, 藥效 /药效 yàoxiào, 療效 /疗效 liáoxiào |
| Português | eficácia |
| Français | efficience, efficacité |
| Deutsch | Wirksamkeit, Wirkungsvermögen, Wirkvermögen, Wirkungsfähigkeit, Wirkfähigkeit |
| Italiano | efficacia |
| Română | eficacitate |
| Русский | эффекти́вность effektívnostʹ, де́йственность déjstvennostʹ |
noun degree of ability to produce a desired effect
| Deutsch | Wirkungsgrad |
|---|
Talk about this word "efficacy." Wiktionary, via Micwyn, micwyn.com/word/efficacy. Accessed 6 Nov. 2026. efficacy. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/efficacy "efficacy." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/efficacy.Cite this
@misc{efficacy_2026,
title = {efficacy},
howpublished = {Wiktionary, via Micwyn},
year = {2026},
url = {https://micwyn.com/word/efficacy},
urldate = {2026-11-06}
}
