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motor
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motive power
mo·tive pow·er (plural mo·tive pow·ers)


noun 
Definition:
 
1. energy or source of energy: the power or energy that drives a piece of machinery, or the source of that power or energy
2. motivating force: the driving force behind an action or activity
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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