/ Dictionary / Index W World War III: Meaning and Definition of Find definitions for: World War III Pronunciation: [key] a hypothetical world war of the future, often conceived as a nuclear war resulting in the total destruction of the human race. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. World War II world-weary Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language