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Efficacy
6 dictionary results for: efficacy
Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This
ef·fi·ca·cy       [ef-i-kuh-see] Pronunciation Key
–noun, plural -cies.
capacity for producing a desired result or effect; effectiveness: a remedy of great efficacy.
[Origin: 1520–30; < L efficācia, equiv. to efficāc- (see efficacious) + -ia -y3]
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
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American Heritage Dictionary - Cite This Source - Share This
ef·fi·ca·cy       (ěf'ĭ-kə-sē)  Pronunciation Key 
n.   Power or capacity to produce a desired effect; effectiveness.


[Latin efficācia, from efficāx, efficāc-, efficacious; see efficacious.]

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Online Etymology Dictionary - Cite This Source - Share This
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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WordNet - Cite This Source - Share This
efficacy

noun
capacity or power to produce a desired effect; "concern about the safety and efficacy of the vaccine" [ant: inefficaciousness] 

WordNet® 3.0, © 2006 by Princeton University.
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Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Efficacy

Ef"fi*ca*cy\, n. [L. efficacia, fr. efficax. See Efficacious.] Power to produce effects; operation or energy of an agent or force; production of the effect intended; as, the efficacy of medicine in counteracting disease; the efficacy of prayer. "Of noxious efficacy." --Milton.

Syn: Virtue; force; energy; potency; efficiency.

Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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On-line Medical Dictionary - Cite This Source - Share This

efficacy

efficacy: in CancerWEB's On-line Medical Dictionary

On-line Medical Dictionary, © 1997-98 Academic Medical Publishing & CancerWEB
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