/ Dictionary / Index D dereism: Meaning and Definition of Find definitions for: de•re•ism Pronunciation: (dē-rē'iz-um, dā-rā'-), [key] — n. Psychol. autism. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. deregulate Derek 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