/ Dictionary / Index I illegality: Meaning and Definition of Find definitions for: il•le•gal•i•ty Pronunciation: (il"ē-gal'i-tē), [key] — pl. -ties. illegal condition or quality; unlawfulness. an illegal act. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: illegality (Thesaurus) illegal alien illegalize 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