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1. Dictionary

   efficacy

   /ˈɛfɪkəsi/

   noun

   • 1. the ability to produce a desired or intended result: formal "there is little information on the efficacy of this treatment"

   Word Origin early 16th century: from Latin efficacia, from efficax, efficac- (see efficacious).

   Scrabble Points: 21

   • E

     1

   • F

     4

   • F

     4

   • I

     1

   • C

     3

   • A

     1

   • C

     3

   • Y

     4

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2. en.wikipedia.org › wiki › EffectivenessEffectiveness - Wikipedia

   en.wikipedia.org › wiki › Effectiveness

   • Cached

   Efficacy, on the other hand, is the extent to which a desired effect is achieved; the ability to produce a desired amount of the desired effect, or the success in achieving a given goal. Contrary to the term efficiency, the focus of efficacy is the achievement as such, not the resources spent in achieving the desired effect.