/ Dictionary / Index R radiation potential: Meaning and Definition of Find definitions for: radia'tion poten"tial Pronunciation: [key] — Physics. Physics. the potential in volts that must be applied to an atom or molecule to cause it to emit radiation at one of its characteristic frequencies. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. radiation fog radiation pressure Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language