Pronunciation: (en'jun),[key] —n. 1. a machine for converting thermal energy into mechanical energy or power to produce force and motion.
2. a railroad locomotive.
3. a fire engine.
4. any mechanical contrivance.
5. a machine or instrument used in warfare, as a battering ram, catapult, or piece of artillery.
6. Obs.an instrument of torture, esp. the rack.