/ Dictionary / Index I immunize: Meaning and Definition of Find definitions for: im•mu•nize Pronunciation: (im'yu-nīz", i-my'nīz), [key] — -nized, -niz•ing. to make immune. to render harmless or ineffective; neutralize. to grant (a witness) immunity. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: immunize (Thesaurus) immunization immuno- Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language