IPA: /ɪˈmjun.aɪz/
KK: /ɪˈmjunˌaɪz/
To make someone or something resistant to a disease, often by giving them a vaccine.
The doctor will immunize the children against measles.
Past: immunized
Past Participle: immunized
Immunize → It is formed from "immunis" (from Latin, meaning exempt or free from) and the suffix "-ize" (meaning to make or to become). The word "immunize" means to make someone exempt from a disease or to provide immunity.
Think of making someone 'exempt' ('immunis') from illness — that's what immunize means.