Engine
<jargon> 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", or "
search engine".
The hackish 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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Jargon File]
