noun B2 Latin origin efficacy /ˈɛfɪkəsi/  ·  EF-fih-kuh-see مؤثرّتکامیابیصلاحت Roman Urdu: Moassar-iyat ENGLISH MEANING The ability to produce a desired result. Efficacy refers to the capacity of something—such as a drug, a policy, or a method—to achieve the intended effect under ideal conditions. It is often used in scientific, medical, or technical contexts to evaluate[...]