/ Dictionary / Index O open space: Meaning and Definition of Find definitions for: o'pen space' Pronunciation: [key] undeveloped land that is protected from development by legislation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. open sight open-stack Related Content Daily Word Quiz: denizen Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language