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