(computing) A mechanical general-purpose computer, designed by Charles Babbage but never built.

(computing, historical) A mechanical special-purpose computer used to generate tables of values of polynomials.

(thermodynamics) Any device which converts heat energy into mechanical work, by moving heat from a source to a sink.

A piston engine.

Any of several types of internal combustion engine in which the power output is directly rotational.

plural of ion engine

Any engine that generates thrust by expelling matter, especially hot gases produced by igniting a fuel; either a rocket engine or several types of jet engine.

Any of several types of engine having cylinders containing reciprocating pistons, in which a crankshaft is turned by pistons moving up and down within cylinders.

A reaction engine that obtains thrust by jet propulsion which forms its jet exclusively from propellant.

The total volume of air/fuel mixture an engine can draw in during one complete engine cycle.