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effeminate
effendi
efferent
efferent neuron
effervesce
effervescent
effete
efficacious
efficacy
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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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