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motive power

noun
1.
any power used to impart motion; any source of mechanical energy.
2.
Railroads. locomotives or other vehicles that supply tractive power.
Origin
1615-1625
1615-25
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for motive-power

motive power

noun
1.
any source of energy used to produce motion
2.
the means of supplying power to an engine, vehicle, etc
3.
any driving force
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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11
13
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