Definition of immunization
a : the production of immunity in a living organism against a disease or pathogenic agent The plasmids used for immunization have been altered to carry genes specifying one or more antigenic proteins normally made by a selected pathogen …— David B. Weiner et al. also : treatment (as by vaccination) for the purpose of making an organism immune to a disease or pathogenic agent : the administration of an immune-producing substance Measles is the single most infectious common disease—one person with measles who blunders into a crowded room will give it to almost everyone. If there were no immunization, measles would be universal. — Wayne Biddle Those benefits can include preventive care, such as annual physicals, immunizations, and well-baby visits. — Consumer Reports
b : the providing of protection or exemption from something harmful or unwanted (such as legal action) immunization from liability The Interior Department is negotiating with other private landowners to extend similar immunization from prosecution to those who agree to avoid activities that might hurt the bird's chances of survival.— Ken Miller
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