What is the meaning of Prime_mover?

The initial agent that is the cause of all things.

A machine, such as a water wheel or steam engine, that receives and modifies energy as supplied by some natural source or fuel and transforms it into mechanical work

The front part of a semi-trailer type truck, i.e., the tractor to which the trailer part attaches.

A military or heavy construction vehicle.

A person or thing that is seminal and influential.

Source: wiktionary.org