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 © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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Efficacy vs. efficiency?81 month ago

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