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prime mover

    1. the original force in a series of transmissions of force
    2. any initiating or principal force
  1. any natural force applied by people to produce power, as muscular energy or flowing water
  2. a machine, as a turbine, that converts a natural force into productive power
  3. in the Aristotelian philosophical tradition, the first cause of all movement, itself unmoved

See prime mover in American Heritage Dictionary 4

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