C1 noun /ˈɛf.ɪ.kə.si/
efficacy
प्रभावकारिता
Meaning
The ability to produce a desired or intended result; effectiveness.
Example
The efficacy of the vaccine has been proven in trials.
टीका की प्रभावकारिता परीक्षणों में साबित हो चुकी है।