/ Dictionary / Index D derealization: Meaning and Definition of Find definitions for: de•re•al•i•za•tion Pronunciation: (dē-rē"u-lu-zā'shun), [key] — n. Psychiatry. an alteration in perception leading to the feeling that the reality of the world has been changed or lost. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. dere derecognize Related Content Daily Word Quiz: effervescent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language