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generator (n.)
1640s, "person who begets, causes, or produces," from Latin generator "a begetter, producer," agent noun from past participle stem of generare "to bring forth" (see generation). Meaning "machine that generates power" first recorded 1794; sense of "machine that generates electric energy" is from 1879. Fem. generatrix attested from 1650s.
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van de Graaff 
in reference to an electrostatic charge generator, 1934, named for U.S. physicist R.J. van de Graaff (1901-1967).
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stator (n.)

"stationary part of a generator" (opposed to rotor), 1895, from Latin stator, agent noun from stare "to stand" (from PIE root *sta- "to stand, make or be firm"). In classical Latin it meant "an orderly, attendant upon a proconsul."

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dynamo (n.)

"generator for converting mechanical rotation into electric power," 1882, short for dynamo-machine, from German dynamoelektrischemaschine "dynamo-electric machine," coined 1867 by its inventor, German electrical engineer Werner Siemans (1816-1892), from Greek dynamis "power," from dynasthai "to be able, to have power, be strong enough," which is of unknown origin.

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