What does immunization mean?
Immunization is the process of making a person or animal immune to a disease, most often by administering a vaccine that teaches the immune system to recognize and fight a particular pathogen. In everyday public-health contexts, it usually refers to vaccination: a planned series of injections or doses given according to an immunization schedule. The practice is especially associated with childhood programs, but it is also used for influenza, travel-related protection, occupational safety, and outbreaks. “Immunization” is broader than simply naming the act of giving a shot, because it encompasses the development of protective immunity. The word is formal but familiar and is widely used by governments, healthcare providers, and educators. In American English the usual spelling is “immunization,” while British and many other varieties use “immunisation.”
nounImmunization is the process of making a person or animal immune to a disease, typically by administering a vaccine that stimulates protective immunity. The term can also refer more broadly to measures that prevent infection or illness.
- The process of making a person or animal immune to a disease, especially through vaccination.
"Routine immunization protects children against several potentially serious diseases."
"The clinic offered free immunization against influenza during the winter months."
"The book discusses how improved sanitation and widespread immunization reduced the impact of infectious diseases."
Plural immunizations refers to separate instances of the process or to individual vaccination programs or events.
"Schools require several immunizations before children can attend."
Immunization turns prevention into a routine act: a carefully timed injection can prepare the body to recognize a dangerous disease before it encounters the real threat.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does immunization come from?
The word “immunization” was formed in the 19th century from “immune” and the suffix “-ization,” indicating the process of making someone or something immune. “Immune” ultimately comes through Old French from Latin immunis, meaning “free from” or “exempt,” especially from a burden, obligation, or harm. The development reflects the medical practice of protecting people from infectious disease, with vaccination becoming one of the most important methods of inducing immunity.
Related word forms
How immunization is actually used
The standard spelling in American English is “immunization”; British and many other varieties use “immunisation.” The word is commonly used in public health, medicine, and education, and can refer both to administering a vaccine and to the resulting protective process.
Easily confused with immunization
Vaccination is the administration of a vaccine, while immunization is the broader process of becoming immune or being protected against disease.