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Definition of PRIME MOVER
a: an initial source of motive power (as a windmill, waterwheel, turbine, or internal combustion engine) designed to receive and modify force and motion as supplied by some natural source and apply them to drive machinery
b: a powerful tractor or truck usually with all-wheel drive
: the self-moved being that is the source of all motion
: the original or most effective force in an undertaking or work <education is … a prime mover of cultural and societal change — R. C. Buck>