English noun: efficacy | |||
| 1. | efficacy (attribute) capacity or power to produce a desired effect | ||
| Samples | Concern about the safety and efficacy of the vaccine. | ||
| Synonyms | efficaciousness | ||
| Broader (hypernym) | effectiveness, effectivity, effectuality, effectualness | ||
| Attribute | efficacious, inefficacious | ||
| Antonyms | inefficaciousness, inefficacy | ||