Prime mover

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Prime mover may refer to:

Philosophy and theology[edit]

  • The prime mover, primum movens, an unmoved mover in the philosophy of Aristotle, later used by Thomas Aquinas in his cosmological arguments, as a "first cause" of existence



  • Tractor unit or towing engine, a vehicle that provides the motive power to haul a load, as in:
    • Heavy hauler, a large transporter for moving oversize loads too large for road travel without an escort and special permit
    • Semi-trailer truck in Australian English
    • Ballast tractor, a heavy haulage road vehicle designed to pull or push heavy or exceptionally large loads
    • Artillery tractor, a military vehicle hauling an artillery piece
    • Steam tractor, a vehicle powered by a steam engine which is used for pulling
    • Tractor, a vehicle specifically designed to deliver a high tractive effort (or torque) at slow speeds