WordReference Random House Unabridged Dictionary of American English © 2026
alter′native en′ergy, 
  1. Energyenergy, as solar, wind, or nuclear energy, that can replace or supplement traditional fossil-fuel sources, as coal, oil, and natural gas.
  • 1970–75

Collins Concise English Dictionary © HarperCollins Publishers::
alternative energy n
  1. a form of energy that can be derived without exhausting natural resources

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