Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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alternative energy any form of energy other than that which comes from fossil fuel.
alternative energy source any source of energy other than fossil fuel.
alternative fuel a fuel other than fossil fuel used to power an internal combustion engine.
alternative medicine any medical treatment or therapy, such as homeopathy and acupuncture, that is considered nontraditional and is generally not taught in conventional medical schools.