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efflorescence
effluence
effluent
effluvium
efflux
effort
effortless
effrontery
effulgence
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efficient cause
ef·fi·cient cause (plural ef·fi·cient causes)


noun 
Definition:
 
direct cause of change: something that acts directly to initiate or produce changes in something else
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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