/ Dictionary / Index A alternative energy: Meaning and Definition of Find definitions for: alter'native en'ergy Pronunciation: [key] energy, as solar, wind, or nuclear energy, that can replace or supplement traditional fossil-fuel sources, as coal, oil, and natural gas. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. alternative conjunction alternative hypothesis Related Content Daily Word Quiz: illegible Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language