If a person or animal is vaccinated, they are given a vaccine, usually by injection, to prevent them from getting a disease. Dogs must be vaccinated against distemper Have you had your child vaccinated against whooping cough? Measles, mumps and whooping cough are spreading again because children are not being vaccinated. + vaccination vaccinations vac·ci·na·tion Parents were too frightened to bring their children for vaccination Anyone who wants to avoid the flu should consider getting a vaccination. to protect a person or animal from a disease by giving them a vaccine = immunize vaccinate sb against sth