efficacy
noun
capacity or power to produce a desired effect
“concern about the safety and efficacy of the vaccine”
SynonymsefficaciousnessOppositesinefficacy
Source: WordNet 3.1, Princeton University
Efficacy meaning
What does “efficacy” mean? Definitions, examples, synonyms and opposites.
“efficacy” is a noun with one meaning. Its most common meaning is: capacity or power to produce a desired effect.