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. 2013.
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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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Cite This Source
00:10
Motive power is always a great word to know.
So is ort. Does it mean:
a scrap or morsel of food left at a meal.
the offspring of a zebra and a donkey.
Example sentences
As electricity diffused, it became the motive power of merriness.
The main motive power comes from two large batteries.
There was virtually no mention of motive power for aircraft and ships, or how
  that transition would be made.
Appearance was little altered, but a major change had occurred in the motive
  power.
Image for motive power
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