/ Dictionary / Index R R.M.A.: Meaning and Definition of Find definitions for: R.M.A. Pronunciation: [key] — Brit. Brit. Royal Marine Artillery. Royal Military Academy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. RM R.M.C. Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language