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prime mover
WIKTIONARY
prime mover
Noun
  • The initial agent that is the cause of all things. philosophy
  • 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. automotive
  • A military or heavy construction vehicle. US