inoculate

American  

[ih-nok-yuh-layt] / ɪˈnɒk jəˌleɪt /

verb (used with object)

• inoculates,
  present (3rd person singular)
• inoculated,
  past participle,  past
• inoculating
  present participle

1. to implant (a disease agent or antigen) in a person, animal, or plant to produce a disease for study or to stimulate disease resistance.

2. to affect or treat (a person, animal, or plant) in this manner.

3. to introduce (microorganisms) into surroundings suited to their growth, as a culture medium.

4. to imbue (a person), as with ideas.

   Synonyms:

   infuse, indoctrinate

5. Metallurgy. to treat (molten metal) chemically to strengthen the microstructure.

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verb (used without object)

• inoculates,
  present (3rd person singular)
• inoculated,
  past participle,  past
• inoculating
  present participle

1. to perform inoculation.

inoculate British  

/ ɪˈnɒkjʊˌleɪt /

verb

1. to introduce (the causative agent of a disease) into the body of (a person or animal), in order to induce immunity

2. (tr) to introduce (microorganisms, esp bacteria) into (a culture medium)

3. (tr) to cause to be influenced or imbued, as with ideas or opinions

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Usage

What’s the difference between inoculate, vaccinate, and immunize? In the context of medicine, inoculate, vaccinate, and immunize are often used in overlapping ways, and for good reason—they all involve introducing a substance (especially a vaccine) into a person’s body with the goal of preventing them from getting a particular disease. Vaccinate is the most specific of the three terms, because it always involves introducing a vaccine, which usually consists of a small amount of a killed, weakened, or otherwise modified version of a disease (such as a virus or bacterium). While inoculate has other meanings outside the context of medicine, in modern healthcare it’s typically used interchangeably with vaccinate (though it’s used less commonly). Immunize is slightly different—it means to provide immunity from a specific disease. While the goal of vaccinating someone is often to immunize them, not all vaccines provide permanent immunity. Some vaccines provide what amounts to long-term immunity, while others only lead to a temporary protection, after which the body “forgets” how to make certain antibodies. In these cases, a booster shot or dose is often required, consisting of a follow-up vaccination to boost or renew the protection gained from the earlier vaccination. Want to learn more? Read the full breakdown of the difference between inoculate, vaccinate, and immunize.

Other Word Forms

Derived Forms

• inoculation
  noun
• inoculator
  noun
• reinoculate
  verb
• inoculative
  adjective
• noninoculative
  adjective
• self-inoculated
  adjective
• uninoculated
  adjective
• uninoculative
  adjective

Inflected Forms

Participles

• inoculating
  present
• inoculated
  past

Conjugated Forms

Present

• inoculate
  simple
• inoculates
  simple
• have inoculated
  perfect
• has inoculated
  perfect
• am inoculating
  progressive
• are inoculating
  progressive
• is inoculating
  progressive
• have been inoculating
  perfect progressive
• has been inoculating
  perfect progressive

Past

• inoculated
  simple
• had inoculated
  perfect
• was inoculating
  progressive
• were inoculating
  progressive
• had been inoculating
  perfect progressive

Future

• will inoculate
  simple
• will have inoculated
  perfect
• will be inoculating
  progressive
• will have been inoculating
  perfect progressive

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Etymology

Origin of inoculate

First recorded in 1400–50; late Middle English, from Latin inoculātus, past participle of inoculāre “to graft by budding, implant,” equivalent to in- “in” + -oculā- (stem of -oculāre “to graft,” derivative of oculus “eye, bud”) + -tus past participle suffix; see in- ²

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Explanation

If you inoculate someone, you try to make him immune to a disease by injecting a little dose of it, so his body can make antibodies to fight it off. When you were little you probably got a vaccine to inoculate you against smallpox. When inoculate first came into English in the 15th century, it referred to inserting a bud onto another plant. Now you’re more likely to hear it used to describe the process of building up immunity to a disease by giving someone a vaccine, which also involves the insertion of foreign matter. You can also inoculate someone metaphorically, with ideas.

Example Sentences

See Examples For:

inoculate inoculates inoculated inoculating

Vaccination teams aim to inoculate about 5,000 little penguins closest to the visitor areas, the state official said, in a program that is likely to last weeks and months, not days.

From Barron's ● Aug. 20, 2026

During Strategy’s first-quarter earnings call in May, Saylor said the company would “probably sell some bitcoin to fund a dividend just to inoculate the market, just to send the message that we did it.”

From MarketWatch ● Jun. 1, 2026

Wilson believed that public anonymity would inoculate the organization against members’ exploitation of AA for personal or professional gain and keep it free from controversy and embarrassment.

From Slate ● Sep. 10, 2025

Haffkine developed a vaccine to combat the plague and Saklatvala went door-to-door, convincing people to inoculate themselves.

From BBC ● Oct. 19, 2024

In retrospect, Fenn told me, “One of George Washington’s most brilliant moves was to inoculate the army against smallpox during the Valley Forge winter of ’78.”

From "1491" by Charles C. Mann

The familiarity inoculates them against the fear, which may then become fascination.

From Scientific American ● Sep. 18, 2022

“Injecting places like the Wing Luke into society inoculates against bigotry and racism and hatred,” he says.

From Seattle Times ● Jul. 25, 2021

A health worker inoculates a woman with her first dose of the Moderna COVID-19 vaccine at the Saint Damien Hospital in Port-au-Prince, Haiti July 19, 2021.

From Reuters ● Jul. 21, 2021

The hospital’s steady employment normally inoculates the region against economic downturns and keeps unemployment lower here than in surrounding counties, said Fred Gaffney, president of the Columbia Montour Chamber of Commerce.

From Washington Post ● May 12, 2020

Matthew inoculates people against the memory serum all throughout the day, Cara and Caleb and Tris and Nita and Reggie and himself.

From "Allegiant" by Veronica Roth

The government and Unicef launched an emergency vaccination campaign in April in certain regions, and have so far inoculated more than 18.4m children.

From BBC ● Jul. 8, 2026

Even in difficult conditions, the plants treated with fungi survived longer than those that were not inoculated.

From Science Daily ● Mar. 12, 2026

A new recommendation passed by the committee will tell parents of most infants to consult with doctors about whether their babies should be inoculated at birth.

From Barron's ● Dec. 5, 2025

Parents have been able to choose whether to delay or decline to have their infants inoculated, according to the Vaccine Integrity Project.

From The Wall Street Journal ● Dec. 5, 2025

I remembered that when an epidemic is about to hit somewhere, that community’s people are inoculated against exposure with some of the same germs that are anticipated—and this prepares them to resist the oncoming virus.

From "The Autobiography of Malcolm X" by Alex Malcolm X;Hailey

Is he trying to scare parents into not inoculating children?

From The Wall Street Journal ● Aug. 11, 2026

Another collaborator, Deb Cabin, who studies prion disease at the McLaughlin Research Institute, flew out from Great Falls, Montana, to instruct them on inoculating the mice with infectious prion.

From Science Magazine ● Mar. 21, 2024

I knew, as many historians knew before me, that free and enslaved West Africans on both sides of the Atlantic were inoculating against disease before the early 18th century.

From Slate ● Sep. 4, 2023

Like I’m hearing that pre-bunking, inoculating people against disinformation might be really helpful, along with flooding the zone with facts.

From Seattle Times ● Sep. 16, 2022

“You can’t remember, Polly, when we first started inoculating for smallpox.”

From "Carry On, Mr. Bowditch" by Jean Lee Latham

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Related Words

• inject
• vaccinate

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