/ Dictionary / Index C complement fixation: Meaning and Definition of Find definitions for: com'plement fixa"tion Pronunciation: [key] — Immunol. Immunol. the binding of complement to immune complexes or to certain foreign surfaces, as those of invading microorganisms. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. complemented complement-fixation test Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language