a machine for converting thermal energy into mechanical energy or power to produce force and motion.
a railroad locomotive.
any mechanical contrivance.
a machine or instrument used in warfare, as a battering ram, catapult, or piece of artillery.
Obsolete. an instrument of torture, especially the rack.

1250–1300; Middle English engin < Anglo-French, Old French < Latin ingenium nature, innate quality, especially mental power, hence a clever invention, equivalent to in- in-2 + -genium, equivalent to gen- begetting (see kin) + -ium -ium

engineless, adjective
multiengine, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
engine (ˈɛndʒɪn)
1.  any machine designed to convert energy, esp heat energy, into mechanical work: a steam engine; a petrol engine
2.  a.  a railway locomotive
 b.  (as modifier): the engine cab
3.  military any of various pieces of equipment formerly used in warfare, such as a battering ram or gun
4.  obsolete any instrument or device: engines of torture
[C13: from Old French engin, from Latin ingenium nature, talent, ingenious contrivance, from in-² + -genium, related to gignere to beget, produce]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, from O.Fr. engin "skill, cleverness," also "war machine," from L. ingenium "inborn qualities, talent," from in- "in" + gen-, root of gignere "to beget, produce." At first meaning a trick or device, or any machine (especially military); sense of one that converts energy to mechanical power is
18c., especially of steam engines.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
engine  [%PREMIUM_LINK%]     (ěn'jĭn)  Pronunciation Key 
A machine that turns energy into mechanical force or motion, especially one that gets its energy from a source of heat, such as the burning of a fuel. The efficiency of an engine is the ratio between the kinetic energy produced by the machine and the energy needed to produce it. See more at internal-combustion engine, steam engine., See also motor.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Bible Dictionary

Engines definition

(1.) Heb. hishalon i.e., "invention" (as in Eccl. 7:29) contrivances indicating ingenuity. In 2 Chr. 26:15 it refers to inventions for the purpose of propelling missiles from the walls of a town, such as stones (the Roman balista) and arrows (the catapulta). (2.) Heb. mechi kobollo, i.e., the beating of that which is in front a battering-ram (Ezek. 26:9), the use of which was common among the Egyptians and the Assyrians. Such an engine is mentioned in the reign of David (2 Sam. 20:15).

Easton's 1897 Bible Dictionary
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Example sentences for engines
The trebuchet is often confused with the earlier, less powerful torsion engines.
The increasing trend is to make engines smaller yet more efficient.
Some were fitted with engines while others were towed to the beach.
Engines of logic mathematicians and the origin of the computer.
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