| NOUN | attribute | efficacy, efficaciousness | capacity or power to produce a desired effect |
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| Sounds | eh'fihkae.siy | |
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| Rhymes | absorbency ... Yangtze: 255 rhymes with siy... | |
| Meaning | Capacity or power to produce a desired effect. | |
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| Example | "concern about the safety and efficacy of the vaccine" | |
| Synonym | efficaciousness | |
| Attributes | efficacious | marked by qualities giving the power to produce an intended effect |
| inefficacious | lacking the power to produce a desired effect | |
| Broader | effectiveness, effectivity, effectualness, effectuality | Power to be effective |
| Opposite | inefficacy, inefficaciousness | A lack of efficacy |
| Spanish | diligencia, efectividad, eficacia | |
| Catalan | eficàcia, eficiència | |
| Adjectives | efficacious | marked by qualities giving the power to produce an intended effect |
| efficacious | producing or capable of producing an intended result or having a striking effect | |
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