/ Dictionary / Index R RF: Meaning and Definition of Find definitions for: RF Pronunciation: [key] radiofrequency. rf. Pronunciation: [key] — Baseball. Baseball. right fielder. R.F. Pronunciation: [key] Reserve Force. r.f. Pronunciation: [key] range finder. rapid-fire. reducing flame. right field. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rf (Thesaurus) rezone R.F.A. Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language