efficacy

Noun
  1. Capacity or power to produce a desired effect (synset 105207137)
    "concern about the safety and efficacy of the vaccine"
    tells us about:
    • efficacious - marked by qualities giving the power to produce an intended effect
    • inefficacious - lacking the power to produce a desired effect
    is a type of: effectiveness, effectivity, effectuality, effectualness - power to be effective; the quality of being able to bring about an effect
    same as: efficaciousness

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