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

Saylor, Strategy’s founder and executive chairman, raised the possibility, telling investors, “We’ll probably sell some bitcoin to fund a dividend just to inoculate the market, just to send the message that we did it. ‘

From MarketWatch ● May 6, 2026

One crucial way to help inoculate boys against this content, West said, is to ask them questions about the creators’ underlying agendas: “How is this tactic being used to push engagement or push a product?”

From Salon ● Nov. 21, 2025

They inoculate about 2,000 koalas a year through wildlife hospital trials and tack themselves onto development projects or research studies in the region that involve their capture.

From BBC ● Dec. 29, 2024

“Just inoculate them? I want to be the one who tells them.”

From "Allegiant" by Veronica Roth

“There’s mold spores and fungus spores, so that inoculates your pile full of that goodness,” she says.

From Seattle Times ● Apr. 28, 2023

But the study did not test how well the students could discern fake from real news, so it is hard to know how well the program inoculates students against falsehoods.

From Scientific American ● Jan. 25, 2022

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 videos were part of a wave of misinformation that accompanied a child vaccination campaign this year that saw more than seven million Filipinos inoculated.

From Barron's ● Oct. 2, 2026

Travelling with animals abroad is even more difficult because they need paperwork, for instance showing that they have been inoculated against rabies.

From BBC ● Apr. 25, 2026

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

From Science Daily ● Mar. 12, 2026

The problem with this line is that unvaccinated children can sicken infants and immuno-compromised children who can’t be inoculated, leaving some disabled or worse.

From The Wall Street Journal ● Jan. 22, 2026

“I’m immune to your charms. I’ve been inoculated by one not-girlfriend too many.”

From "I'll Give You the Sun" by Jandy Nelson

They could even open the door to the possibility that people could help the plants migrate by inoculating certain areas with specific types of mycorrhizal fungi, Egan said.

From Los Angeles Times ● May 19, 2026

Rabbi David Baron of Temple of the Arts wishes to create a global curriculum on “altruistic behavior”—his way of inoculating the young against extremism—in honor of the 1.5 million Jewish children murdered by the Nazis.

From The Wall Street Journal ● Nov. 20, 2025

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

That’s the principle of vaccination: to stimulate our antibody production without our having to go through the actual experience of the disease, by inoculating us with a dead or weakened strain of microbe.

From "Guns, Germs, and Steel: The Fates of Human Societies" by Jared M. Diamond

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Related Words

• inject
• vaccinate

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