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EFFICACY

 - 3 dictionary results

ef⋅fi⋅ca⋅cy

  [ef-i-kuh-see]
–noun, plural -cies.
capacity for producing a desired result or effect; effectiveness: a remedy of great efficacy.
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Origin:
1520–30; < L efficācia, equiv. to efficāc- (see efficacious ) + -ia -y 3
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2010.
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ef·fi·ca·cy   (ěf'ĭ-kə-sē)   
n.  Power or capacity to produce a desired effect; effectiveness.

[Latin efficācia, from efficāx, efficāc-, efficacious; see efficacious.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

efficacy 
1527, from L. efficacia, from efficax (gen. efficacis) "effective," from efficere "work out, accomplish" (see effect).
Online Etymology Dictionary, © 2001 Douglas Harper
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