inoculate

American  

[ih-nok-yuh-leyt] / 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.

---

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

---

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

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

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

Anyone lampooned with a scintilla of brutality knows that an appearance can temporarily inoculate against accusations of humorlessness.

From Salon ● Mar. 6, 2026

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

From BBC ● Oct. 19, 2024

With its support, he rededicated himself to serving God, and by his senior year he was running his own Bible-study group, hoping to inoculate first-year students against the temptations he had faced.

From "Class Matters" by The New York Times

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

From Seattle Times ● Apr. 28, 2023

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

From Scientific American ● Sep. 18, 2022

Prime Minister Scott Morrison has promised lockdowns would be "less likely" once the country inoculates 70% of its population above 16 years, which now stands at 19%.

From Reuters ● Aug. 2, 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

Arrieta said she was "inoculated" to the obstacles she kept encountering as a businesswoman but was nonetheless considering closing shop.

From Barron's ● Jul. 3, 2026

To halt its spread, Gen. Washington—who survived smallpox when he was 19—had all his soldiers inoculated, which helped sustain the force for the rest of the Revolutionary War.

From The Wall Street Journal ● Apr. 14, 2026

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

From Science Daily ● Mar. 12, 2026

To test this question, many years ago my colleagues and I prepared chambers that simulated the Martian environment as it was then known, inoculated them with terrestrial microorganisms and waited to see if anybody survived.

From "Cosmos" by Carl Sagan

Is he trying to scare parents into not inoculating children?

From The Wall Street Journal ● Aug. 11, 2026

“It’s almost a way of inoculating himself when he is surrounding himself with loyalists who have gone through similar travails.”

From Los Angeles Times ● Dec. 8, 2024

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

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

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

Related Words

• inject
• vaccinate