efficacies

efficacy

[ef-i-kuh-see]
noun, plural efficacies.
capacity for producing a desired result or effect; effectiveness: a remedy of great efficacy.

Origin:
1520–30; < Latin efficācia, equivalent to efficāc- (see efficacious) + -ia -y3

nonefficacy, noun
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World English Dictionary
efficacy (ˈɛfɪkəsɪ)
 
n
the quality of being successful in producing an intended result; effectiveness

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

efficacy
1520s, from L. efficacia, from efficax (gen. efficacis) "effective," from efficere "work out, accomplish" (see effect).
Online Etymology Dictionary, © 2010 Douglas Harper
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