/ Dictionary / Index D degradation of energy: Meaning and Definition of Find definitions for: degrada'tion of en'ergy Pronunciation: [key] — Thermodynamics. Thermodynamics. the principle that during any irreversible process the total energy available to do work decreases. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. degradation degrade Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language