/ Dictionary / Index D deration: Meaning and Definition of Find definitions for: de•ra•tion Pronunciation: (dē-rā'shun), [key] — v.t. to discontinue the rationing of (something). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. derangement deratization Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language