Inherent capacity for growth and development; potentiality.
The ratio of the energy delivered by a machine to the energy supplied for its operation.
(Cinematography) An illusion produced by technical means (as in "special effect")
(Psychol.) An emotion or feeling attached to an idea, object, etc.
The condition or fact of being insufficient or falling short:
An inefficient act, design, or procedure:
Find another word for efficacy. In this page you can discover 29 synonyms, antonyms, idiomatic expressions, and related words for efficacy, like: effectiveness, potency, productiveness, ability, effectuality, inefficacy, efficiency, impotency, efficaciousness, advantage and effect.