/ Dictionary / Index D deep space: Meaning and Definition of Find definitions for: deep' space' Pronunciation: [key] space beyond the limits of the solar system. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Deep South deep structure Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language