Generator n. : One who, or that which, generates, begets, causes, or produces.

Generator 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.

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

Example:
Why is a Generator armature more difficult to rotate when it is connected to and supplying electric current?

Taxonomy
generator, dynamo, rotor, magnetic field, alternator, electrical generator, magnets, power, internal resistance, voltage, field coils, measure, MHD generator, power generation, wire, Jedlik's dynamo, rare earth magnets, Electric Motors.

Defination from the web:
generator is a device that converts mechanical energy to electrical energy, generally using electromagnetic induction. ... A generator forces electric charges to move through an external electrical circuit, but it does not create electricity ...