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From The Collaborative International Dictionary of English v.0.48:
Generator \Gen"er*a`tor\, n. [L.] 1. One who, or that which, generates, begets, causes, or produces. [1913 Webster] 2. An apparatus in which vapor or gas is formed from a liquid or solid by means of heat or chemical process, as a steam boiler, gas retort, or vessel for generating carbonic acid gas, etc. [1913 Webster] 3. (Mus.) The principal sound or sounds by which others are produced; the fundamental note or root of the common chord; -- called also generating tone. [1913 Webster] 4. (Elec.) Any machine that transforms mechanical into electrical energy; a dynamo. [Webster 1913 Suppl.] 5. (Math.) a mathematical entity which, when subjected to an operation, yields another mathematical entity; also, a generatrix. [PJC]