motive-power

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:
1615–25

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
motive power
 
n
1.  any source of energy used to produce motion
2.  the means of supplying power to an engine, vehicle, etc
3.  any driving force

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