(1):

(n.) Any machine that transforms mechanical into electrical energy; a dynamo.

(2):

(n.) The principal sound or sounds by which others are produced; the fundamental note or root of the common chord; - called also generating tone.

(3):

(n.) 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.

(4):

(n.) One who, or that which, generates, begets, causes, or produces.