Definition of "prime mover" [prime mover]

• One regarded as the initial source of energy directed toward a goal: Patriotism was the prime mover of the revolution. (noun)
• The initial force, such as electricity, wind, or gravity, that engages or moves a machine. (noun)
• A machine or mechanism that converts natural energy into work. Also called primum mobile. (noun)
• Any of various heavy-duty trucks or tractors. (noun)
• Philosophy In Aristotelian philosophy, the self-moved being that causes all motion. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "In close juxtaposition repose the mortal remains of Marcus Tullius Cicero and the Constable Bourbon, who appeared at wide intervals upon this world's stage and with no trait in common save the "sacra fames auri," which was the moving principle of both, each became in his own way a prime mover on its chess board."
• "Mr. Holden is regarded by the Conservatives of the State as the prime mover in all the political crimes with which he was charged."
• "Conceivably, as I have stated, the Muscovy Company, a much interested party, was the prime mover in the seizure of Hudson out of the Dutch service."