/ Dictionary / Index R Riesz space: Meaning and Definition of Find definitions for: Riesz' space" Pronunciation: (rēs), [key] a topological space in which sets containing one point are closed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Riesman Rieti Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language