/ Dictionary / Index I idiot: Meaning and Definition of Find definitions for: id•i•ot Pronunciation: (id'ē-ut), [key] — n. an utterly foolish or senseless person. a person of the lowest order in a former classification of mental retardation, having a mental age of less than three years old and an intelligence quotient under 25. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: idiot (Thesaurus) idiosyncrasy idiot board Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language