/ Dictionary / Index I illegal: Meaning and Definition of Find definitions for: il•le•gal Pronunciation: (i-lē'gul), [key] — adj. forbidden by law or statute. contrary to or forbidden by official rules, regulations, etc.: The referee ruled that it was an illegal forward pass. —n. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: illegal (Thesaurus) Ille-et-Vilaine illegal alien Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language