efficacy
UK /ˈɛf.ɪ.kə.si/ US /ˈɛf.ɪ.kə.si/
noun 2
Definitions
noun
1
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.
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?
2
A degree of ability to produce a desired effect; effectiveness.
Toothbrush with improved efficacy
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