<p><strong>Noun</strong></p><ul><li>a machine for converting thermal energy into mechanical energy or power to produce force and motion</li><li>a railroad locomotive</li><li>a fire engine</li><li>a piece or collection of software that drives a later process (used in combination, as in game engine software engine)</li><li>search engine</li><li>any mechanical contrivance</li><li>a machine or instrument used in warfare, as a battering ram, catapult, or piece of artillery</li><li>a means by which something is achieved, accomplished, or furthered: Trade is an engine of growth that creates jobs, reduces poverty, and increases economic opportunity</li><li>an instrument of torture, especially the rack</li></ul>