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alternative fuel

noun
1.
a vehicular fuel that is not entirely derived from petroleum, as natural gas, hydrogen, or an alcohol mixture:
the environmental benefits of alternative fuels.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Contemporary definitions for alternative fuel
noun

a fuel other than gasoline or diesel for powering motor vehicles, often with improved energy efficiency and pollution reduction features

Examples

Electricity, natural gas, hydrogen, and fuel cells are examples of alternative fuel.

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