/ Dictionary / Index M megabyte: Meaning and Definition of Find definitions for: meg•a•byte Pronunciation: (meg'u-bīt"), [key] — n. Computers. 2 (1,048,576) bytes. (loosely) one million bytes. Abbr.: MB Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: megabyte (Thesaurus) megabuck megacephalic Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language