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.

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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

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

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

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

They’re upgraded preparations of vaccines that themselves underwent placebo-controlled trials, or formulations aimed at new variants of the targeted disease, or shots that inoculate against several diseases all at once.

From Los Angeles Times ● May 8, 2025

He took him into business and tried to inoculate him with the joys of buying and selling, of outwitting other men, of judging them for a bluff, of living by maneuver.

From "East of Eden" by John Steinbeck

“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

The spike protein triggers an immune response in the human body that inoculates against infection.

From Washington Post ● Aug. 26, 2022

Is it comfort with risk or faith in nature and self that inoculates extreme and adventure athletes like Grosmaire to danger?

From New York Times ● May 9, 2022

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

Can parents still have their children inoculated at birth?

From The Wall Street Journal ● Dec. 5, 2025

It won’t be tetanus, as they inoculated us, but may be septicemia; I don’t think those pins were very clean.

From "Code Name Verity" by Elizabeth Wein

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

“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

They were merely inoculating a community against an outbreak.

From "The God of Small Things" by Arundhati Roy

Related Words

• inject
• vaccinate