Energy transferred by radiation, especially by an electromagnetic wave.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "radiant energy" in a sentence
"Planck suggested that radiant energy exists only in discrete packages that he called quanta."