noun, plural ef·fi·ca·cies.
Is efficacy singular or plural?
The noun efficacy can be countable or uncountable. In more general, commonly used, contexts, the plural form will also be efficacy. However, in more specific contexts, the plural form can also be efficacies e.g. in reference to various types of efficacies or a collection of efficacies.
How do you use efficacy?
Efficacy in a Sentence ?
- Fortunately, the medicine had the efficacy to reduce the amount of pain John was feeling.
- Since the traffic reports have not been announced yet, the efficacy of the new drunk driving laws cannot be confirmed.
- The instructor's efficacy was reduced by the lack of educational materials.
