prime mover

== English == === Etymology === Originally in translation of Latin primum mobile. === Noun === prime mover (plural prime movers) (philosophy) The initial agent that is the cause of all things. Synonyms: first cause, first mover, primum mobile, unmoved mover 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 (automotive) Tractor unit. Or, more specifically, the front part of a semi-trailer type truck, i.e., the tractor to which the trailer part attaches. (US) A military or heavy construction vehicle. A person or thing that is seminal and influential. ==== Translations ==== === References === “prime mover”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.