/ Dictionary / Index M megaton: Meaning and Definition of Find definitions for: meg•a•ton Pronunciation: (meg'u-tun"), [key] — n. one million tons. an explosive force equal to that of one million tons of TNT, as that of atomic or hydrogen bombs. Abbr.: MT Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: megaton (Thesaurus) megatherm megatonnage Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language