n. Innate or natural ability; ingenuity; craft; skill.n. An artful device or contrivance; a skilfully devised plan or method; a subtle artifice.n. An instrumental agent or agency of any kind; anything used to effect a purpose; an instrumentality.n. An apparatus for producing some mechanical effect; especially, a skilful mechanical contrivance: used in a very general way.n. Specifically— A snare, gin, or trap.n. A mechanism, instrument, weapon, or tool by which a violent effect is produced, as a musket, cannon, rack, catapult, battering-ram, etc.; specifically, in old use, a rack for torture; by extension, any tool or instrument: as, engines of war or of torture.n. More particulary— A skilfully contrived mechanism or machine, the parts of which concur in producing an intended effect; a machine for applying any of the mechanical or physical powers to effect a particular purpose; especially, a self-contained, self-moving mechanism for the conversion of energy into useful work: as, a hydraulic engine for utilizing the pressure of water; a steam-, gas-, or air-engine, in which the elastic force of steam, gas, or air is utilized; a fire-engine; stationary or locomotive engines. In popular absolute use, the word generally has reference to a locomotive engine. See these words.To contrive.To assault with engines of war.To torture by means of an engine; rack.To furnish with an engine or engines: as, the vessel was built on the Clyde and engined at Greenwich.n. A locomotive which has two or more pairs of driving-wheels coupled together by side or parallel rods.n. A form of engine in which the crank is driven by the pressure on two rectangular pistons, the second of which traverses in a suitable recess in the first This double motion enables the pistons to follow the angular displacement of the crank without the use of connecting-rods, and gives a square section to the case inclosing the two pistons.