Meaning of Efficacy | Babel Free

Definitions

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

Equivalents

Examples

“[…]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.”

The Religion of a Doctor

“No method of verification known to science is applicable to the efficacy of prayer. […] If, then, the efficacy of prayer eludes the test of science, and if even uncertainty may rest upon the connection between an event asked in prayer, and the prayer that sought it, is there any evidence by which the efficacy of prayer may be tested and known?”

“2005, Flay et al. Standards of Evidence: Criteria for Efficacy, Effectiveness and Dissemination DOI: 10.1007/s11121-005-5553-y Efficacy refers to the beneficial effects of a program or policy under optimal conditions of delivery, whereas effectiveness refers to effects of a program or policy under more real-world conditions.”

“Toothbrush with improved efficacy”

CEFR level