Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun One billion (109) watts.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun One thousand million ( 109 ) watts, abbreviated as GW.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From giga- +‎ watt

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