Immunization (noun)

1. The process of making a person immune to a particular disease, usually by administering a vaccine.
2. The state of being immune to a disease.
3. The protection of a person or population from infectious diseases by vaccination.

Origin:

Derived from the latin word 'immunis' meaning 'free, exempt'.

Examples:

1. The immunization against smallpox was one of the biggest public health achievements in history.
2. The immunization against chickenpox is usually done in childhood.
3. The immunization rate for measles in the country has reached over 90%.
4. The immunization of the population was key to controlling the spread of the disease.
5. The immunization of the travelers against yellow fever was mandatory for entry into some countries.