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efficacy

Pronunciation: /ˈɛf.ɪ.kə.si/

The English word “efficacy” has 2 meanings listed here.

noun

  1. The ability to produce a desired effect under ideal testing conditions.
  2. A degree of ability to produce a desired effect; effectiveness.

Etymology

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

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.