prime mover

1. The initial agent that is the cause of all things.

   unbewegter Beweger

   первопричи́наpervopričína

   an agent that is the cause of all things but does not itself have a cause

2. 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

   Kraftmaschine, Energiemaschine

   перви́чный дви́гательpervíčnyj dvígatelʹ

3. Tractor unit. Or, more specifically, the front part of a semi-trailer type truck, i.e., the tractor to which the trailer part attaches.

   тяга́чtjagáč, букси́рbuksír, тра́кторtráktor

4. (US)A military or heavy construction vehicle.

5. A person or thing that is seminal and influential.

6. An agonist muscle.

regular