Akademik

efficacy
noun
capacity or power to produce a desired effect (Freq. 6)
-

concern about the safety and efficacy of the vaccine

Syn: ↑efficaciousness
Ant: ↑inefficacy
Derivationally related forms: ↑efficacious (for: ↑efficaciousness), ↑efficacious
Hypernyms: ↑effectiveness, ↑effectivity, ↑effectualness, ↑effectuality
Attrubites: ↑efficacious, ↑inefficacious

Useful english dictionary. 2012.