en·gine 
/ˈɛnʤən/ noun
plural en·gines /ˈɛnʤən/ noun [count] 1 : a machine that changes energy (such as heat from burning fuel) into mechanical motion
▪ The car has a four-cylinder engine. ▪ jet/diesel engines 2 : the vehicle that pulls a train : locomotive 3 formal + literary a : something that is used for a particular purpose
▪ tanks, planes, and other engines of war/destruction
b : something that produces a particular and usually desirable result
▪ The tax cut could be an engine of economic growth.
▪ The car has a four-cylinder engine. ▪ jet/diesel engines
▪ tanks, planes, and other engines of war/destruction
b : something that produces a particular and usually desirable result
▪ The tax cut could be an engine of economic growth.
— see also fire engine, search engine
