/ Dictionary / Index R RI: Meaning and Definition of Find definitions for: RI Pronunciation: [key] Rhode Island (approved esp. for use with zip code). R.I. Pronunciation: [key] Queen and Empress. King and Emperor. Rhode Island. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ri (Thesaurus) rhyton ria Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language