English Dictionary

efficacy

/ˈɛf.ɪ.kə.si/

noun

Ability to produce a desired effect under ideal testing conditions. / Degree of ability to produce a desired effect; effectiveness.

The efficacy of the new drug is still being tested.

意味（1）

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.

意味（2）

Degree of ability to produce a desired effect; effectiveness.

Toothbrush with improved efficacy