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immunization

noun
im·​mu·​ni·​za·​tion
variants: also British immunisation \ ˌim-​yə-​nə-​ˈzā-​shən How to pronounce immunisation (audio) \

Medical Definition of immunization

: the creation of immunity usually against a particular disease especially : treatment (as by vaccination) of an organism for the purpose of making it immune to a particular pathogen immunization against polio

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