/ Dictionary / Index R RSE: Meaning and Definition of Find definitions for: RSE Pronunciation: [key] Received Standard English. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. RSD rselection Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language