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efficacy - 4 dictionary results
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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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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Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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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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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