Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun efficaciousness

1 sense of efficaciousness

Sense 1
efficacy, efficaciousness -- (capacity or power to produce a desired effect; "concern about the safety and efficacy of the vaccine")
       => effectiveness, effectivity, effectualness, effectuality -- (power to be effective; the quality of being able to bring about an effect)