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efficient consumer response
efficient diversification
efficient frontier
efficient set
effigy
effing
effloresce
efflorescence
effluence
effluent
effluvium
efflux
effort
effortless
effrontery
effulgence
effuse
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efficacy
ef·fi·ca·cy [ éffikəssee ] or ef·fi·cac·i·ty [ èffi kássətee ]


noun 
Definition:
 
effectiveness: the ability to produce the desired result
[Early 16th century. < Latin efficacia< efficac- (see efficacious)]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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