efficacy Hear it!

efficacy definition

ef·fi·cacy (ef′i kə sē)

noun

power to produce effects or intended results; effectiveness

Etymology: ME & OFr efficace < L efficacia < efficax: see efficacious

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

Comments
Improve this definition.
Do you have more to add? Share your linguistic knowledge or observation.
/Register to save your comments.
Related Discussions (1)
TopicRepliesLatest Post
Efficacy vs. efficiency?81 month ago

Browse Forums