/ Dictionary / Index O open order: Meaning and Definition of Find definitions for: o'pen or'der Pronunciation: [key] — Mil. Mil. a troop formation for drill or basic combat training, the intervals between the individuals being greater than those in close order. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. open-mouthed open-pit Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language