Source : Webster's Revised Unabridged Dictionary (1913)

Generator \Gen"er*a`tor\, n. (Elec.)
   Any machine that transforms mechanical into electrical
   energy; a dynamo.

Generator \Gen"er*a`tor\, n. [L.]
   1. One who, or that which, generates, begets, causes, or
      produces.

   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.

   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}.

Source : WordNet®

generator
     n 1: an apparatus that produces a vapor or gas
     2: engine that converts mechanical energy into electrical
        energy by electromagnetic induction
     3: someone who originates or causes or initiates something; "he
        was the generator of several complaints" [syn: {source}, {author}]
     4: an electronic device for producing a signal voltage