alternative energy

noun
energy, as solar, wind, or nuclear energy, that can replace or supplement traditional fossil-fuel sources, as coal, oil, and natural gas.

Origin:
1970–75

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
alternative energy
 
n
Also called: renewable energy a form of energy derived from a natural source, such as the sun, wind, tides, or waves

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Alternative energy is always a great word to know.
So is doohickey. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a gadget; dingus; thingumbob.
Encyclopedia Britannica
Encyclopedia

alternative energy

usable energy derived from replenishable sources such as the Sun (solar energy), wind (wind power), rivers (hydroelectric power), hot springs (geothermal energy), tides (tidal power), and biomass (biofuels).

Learn more about alternative energy with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Fossil fuels, including methane could tide us over until alternative energy
  sources are discovered.
Alternative energy is also catching on in parts of the developing world where
  it's a necessity, not a choice.
If handled correctly, nuclear energy can be a safe alternative energy.
No one really knows if, or how quickly, alternative energy sources can revive
  the economy and salve the planet.
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