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

In California, the law requires all children without medical exemptions to be vaccinated for several diseases — including polio, measles, mumps, chickenpox, hepatitis B and whooping cough — before they’re admitted to school. — Los Angeles Times, 5 Oct. 2026

There are few details about the fifth person who died, other than the person hadn’t been vaccinated and lived in Lancaster County, where the bulk of measles cases are. — Erika Edwards, NBC news, 5 Oct. 2026

Fewer than 1% of the state's cases are among those who are fully vaccinated with the MMR vaccine, according to DOH. — ABC News, 5 Oct. 2026

But this year, new vaccine options are available, and doctors are urging nearly everyone to get vaccinated. — Stephen Underwood, Hartford Courant, 2 Oct. 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