vaccinate

verb

vac·​ci·​nate ˈvak-sə-ˌnāt 

vaccinated; vaccinating

transitive verb

: to administer a vaccine to usually by injection

intransitive verb

: to perform or practice vaccination

vaccinator

ˈvak-sə-ˌnā-tər 

noun

Examples of vaccinate in a Sentence

We vaccinate all the animals that come to our shelter.

Recent Examples on the Web

An Idaho woman who said her 18-month old twins died after being vaccinated has been charged with their murder, police said. — N'dea Yancey-Bragg, USA Today, 7 July 2026

Because the animal was not tested for rabies, 10 of the family members took public health employees’ advice to be vaccinated as a precaution, which required four rounds of shots. — Bay Area News Group, Mercury News, 6 July 2026

During the 2018 outbreak, USAID helped vaccinate more than 300,000 for the disease, according to Pham. — Sasha Rogelberg, Fortune, 6 July 2026

Across all Tarrant County schools, almost 93% of kindergartners were vaccinated with the measles, mumps, and rubella vaccine in the 2025-26 school year, down from almost 94% the year before. — Ciara McCarthy, Fort Worth Star-Telegram, 2 July 2026

Word History

Etymology

earlier, "to inoculate with fluid from a cowpox pustule," back-formation from vaccination; in later extended sense, in part borrowed from French vacciner, verbal derivative of vaccin vaccine

First Known Use

1882, in the meaning defined at transitive sense

Kids Definition

vaccinate

verb

vac·​ci·​nate ˈvak-sə-ˌnāt 

vaccinated; vaccinating

: to give a vaccine to usually by injection

vaccinator

-ˌnāt-ər 

noun

Medical Definition

vaccinate

1 of 2 verb

vac·​ci·​nate ˈvak-sə-ˌnāt 

vaccinated; vaccinating

transitive verb

1

: to inoculate (a person) with cowpox virus in order to produce immunity to smallpox

2

: to administer a vaccine to usually by injection

intransitive verb

: to perform or practice vaccination

vaccinate

2 of 2 noun

vac·​ci·​nate ˈvak-sə-ˌnāt  -nət 

: a vaccinated individual