immunize

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im·mu·nize / ˈimyəˌnīz/ • v. [tr.] make (a person or animal) immune to infection, typically by inoculation: the vaccine is used to immunize children against measles.DERIVATIVES: im·mu·ni·za·tion / ˌimyəniˈzāshən/ n.im·mu·niz·er n.