Immunity means being protected against a particular infection or disease. You can develop immunity after having an infection or after receiving a vaccine. Immunity may reduce your risk of becoming ill or make the illness less severe.
Immunisation is the process of becoming protected against a disease, usually through vaccination. The term describes the result of gaining immunity, whether from a vaccine or, in some cases, from previous infection.
Vaccinated means that you have received a vaccine to help protect you against a specific disease. Being vaccinated does not always guarantee complete immunity, but it usually reduces the risk of infection and serious illness.
Vaccination is the act of receiving a vaccine. For example, having an injection, oral vaccine, or other approved vaccine to protect against a disease is called vaccination.