Efficacy
WordNet
noun
(1) Capacity or power to produce a desired effect
"Concern about the safety and efficacy of the vaccine"
WiktionaryText
Etymology
< < ; see efficacious.
Noun
- Ability to produce a desired amount of a desired effect.
Related terms
- effect
- effective
- effectiveness
- effectivity
- effector
- effectual
- effectuate
- efficacious
- efficacity
- efficiency
- efficient