prime mover
nounDefinition of prime mover
1a
: an initial source of motive power (such 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
2
: the self-moved being that is the source of all motion
3
: the original or most effective force in an undertaking or work
education is … a prime mover of cultural and societal change— R. C. Buck
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