/ Dictionary / Index C closed universe: Meaning and Definition of Find definitions for: closed' u'niverse Pronunciation: [key] (in cosmology) a hypothetical expanding universe that contains sufficient matter to reverse the observed expansion through its gravitational contraction. Cf. open universe. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. closed union closefisted Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language