/ Dictionary / Index R realm: Meaning and Definition of Find definitions for: realm Pronunciation: (relm), [key] a royal domain; kingdom: the realm of England. the region, sphere, or domain within which anything occurs, prevails, or dominates: the realm of dreams. the special province or field of something or someone: the realm of physics; facts within the realm of political scientists. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: realm (Thesaurus) re-ally real number Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language