/ Dictionary / Index D Distinguished Service Order: Meaning and Definition of Find definitions for: Distin'guished Serv'ice Or"der Pronunciation: [key] — Brit. Mil. Brit. Mil. a decoration awarded for distinguished service in action. Abbr.: D.S.O. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Distinguished Service Medal distinguishing Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language