/ Dictionary / Index I immune complex: Meaning and Definition of Find definitions for: immune' com"plex Pronunciation: [key] an aggregate of an antigen and its specific antibody. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. immune immune response Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language