(Britain, dated) The person who drives the engine of a train.

An engine that obtains thrust by taking in air at the front, using it to burn fuel, then ejecting the hot combustion products at the rear through a propulsive nozzle.

A piston engine driven by steam (as contrasted, for example, with a steam turbine). / Any heat engine that uses steam as its primary working fluid to do mechanical work. / (Britain) A steam locomotive.

(firefighting) A vehicle used by firefighters to pump water to fight a fire. Typically, a fire engine carries a supply of water and has the ability to connect to an external water supply.

(astronautics) a type of spacecraft propulsion, whereby electric fields accelerate ions out the exhaust to provide motive force

(computing) An application that searches for, and retrieves, data based on some criteria, especially one that searches the Internet for documents containing specified words.

A heat engine of the external combustion piston engine type.

(historical) A large weapon of war used, during medieval times, to batter fortifications.

(of an aircraft) powered by two engines, one in each wing

(nautical) A compartment on a ship in which the engine machinery is located. / (idiomatic) The source of power in a team or other group. / (sports) The midfield.