/ Dictionary / Index D DOS: Meaning and Definition of Find definitions for: DOS Pronunciation: (dôs, dos), [key] — n. Computers. any of several single-user, command-driven operating systems for microcomputers, esp. MS DOS. DOS Pronunciation: [key] See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dos (Thesaurus) dory skiff dos-à-dos Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language