section_path: Etymology
section_name: Etymology
paragraph_text: Etymology
  
  At one time, the word engine (via Old French, from Latin ingenium, "ability") meant any piece of machinery —a sense that persists in expressions such as siege engine. A "motor" (from Latin motor, "mover") is any machine that produces mechanical power. Traditionally, electric motors are not referred to as "engines"; however, combustion engines are often referred to as "motors". (An electric engine refers to a locomotive operated by electricity.)
  
  In boating, an internal combustion engine that is installed in the hull is referred to as an engine, but the engines that sit on the transom are referred to as motors.