/ Dictionary / Index R RM: Meaning and Definition of Find definitions for: RM Pronunciation: [key] reichsmark. rm. Pronunciation: [key] — pl. rms. ream. room. r.m. Pronunciation: [key] reichsmark. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. r-less R.M.A. 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