engine
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engine: n.

  1. A piece of hardware that encapsulates some function but can't be used without some kind of front end. Today we have, especially, print engine: the guts of a laser printer.

  2. An analogous piece of software; notionally, one that does a lot of noisy crunching, such as a database engine.

  The hacker senses of engine are actually close to its original, pre-Industrial-Revolution sense of a skill, clever device, or instrument (the word is cognate to ‘ingenuity’). This sense had not been completely eclipsed by the modern connotation of power-transducing machinery in Charles Babbage's time, which explains why he named the stored-program computer that he designed in 1844 the Analytical Engine.

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