/ Dictionary / Index E electromagnetic radiation: Meaning and Definition of Find definitions for: electromagnet'ic radia'tion Pronunciation: [key] — Physics. Physics. radiation consisting of electromagnetic waves, including radio waves, infrared, visible light, ultraviolet, x-rays, and gamma rays. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. electromagnetic pump electromagnetics Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language