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efficacy: Meaning and Definition of

ef•fi•ca•cy

Pronunciation: (ef'i-ku-sē), [key]
— pl. -cies.
  1. capacity for producing a desired result or effect; effectiveness: a remedy of great efficacy.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also:
efficacity efficiency
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