Other forms: immunizations
Immunization is the process of getting a shot that boosts your body's defenses against a certain disease. Before international travel, you may need to get additional immunizations.
Strictly speaking, immunization is action of stimulating your immune system to fight off infection, with the help of a vaccine. You can also use immunization interchangeably with vaccination or inoculation, so you might say, "While I was at the doctor, I went ahead and got my flu immunization." The word comes from immune, "exempt from disease," and its Latin root, which means "exempt."