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English definition of “vaccine”

vaccine

noun [C]  /ˈvæk·sin, vækˈsin/ us  
a special substance that you take into your body to prevent a disease, and that contains a weakened or dead form of the disease-causing organism
vaccinate
verb [T]  /ˈvæk·səˌneɪt/ us  
Our children have been vaccinated for measles and other childhood diseases.
vaccination
noun [C]  /ˌvæk·səˈneɪ·ʃən/ us  
Most states require all children to receive the vaccination before beginning elementary school.
(Definition of vaccine from the Cambridge Academic Content Dictionary © Cambridge University Press)
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