injection

American  

[in-jek-shuhn] / ɪnˈdʒɛk ʃən /

noun

• injections
  plural

1. the act of injecting.

2. something that is injected.

3. a liquid injected into the body, especially for medicinal purposes, as a hypodermic or an enema.

4. state of being hyperemic or bloodshot.

5. Mathematics. a one-to-one function.

6. Also called insertion. Aerospace. the process of putting a spacecraft into orbit or some other desired trajectory.

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injection British  

/ ɪnˈdʒɛkʃən /

noun

1. fluid injected into the body, esp for medicinal purposes

2. something injected

3. the act of injecting

4. 1. the act or process of introducing fluid under pressure, such as fuel into the combustion chamber of an engine

   2. ( as modifier )

      injection moulding

5. maths a function or mapping for which f( x ) = f( y ) only if x = y See also surjection bijection

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injection Scientific  

/ ĭn-jĕk′shən /

1. A substance that is introduced into a organism, especially by means of a hypodermic syringe, as a liquid into the veins or muscles of the body.

2. A function that maps each member of one set (the domain) to exactly one member of another set (the range).

3. Compare bijection surjection

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Other Word Forms

Derived Forms

• reinjection
  noun
• superinjection
  noun
• injective
  adjective
• postinjection
  adjective

Inflected Forms

Nouns

• injections
  plural

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Etymology

Origin of injection

First recorded in 1535–45, injection is from the Latin word injectiōn- (stem of injectiō ). See inject, -ion

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Explanation

An injection is a shot, or a dose of medicine given by way of a syringe and a needle. When you get jabbed in the arm with a tetanus vaccine, that's an injection. The medical kind of injection forces a small amount of a drug under the skin or directly into a muscle. Other injections are similar in that they involve a liquid being forced by pressure, like the fuel injection in a car, which pushes gasoline directly into the engine. Since the 1600s, injection has been used to mean "forcing a fluid into a body," from the Latin inicere, "to throw in" or "to throw on."

Example Sentences

See Examples For:

injection injections

So, Ohtani kept trying to work his way back to the mound for weeks after receiving a lubricating Orthovisc injection in his knee at the beginning of the All-Star break.

From Los Angeles Times ● Oct. 14, 2026

Her case is now in uncharted territory as she is thought to be the only person to have survived an execution attempt by lethal injection.

From BBC ● Oct. 13, 2026

MRI scans were performed before treatment and again four weeks and eight to 12 weeks after the final injection.

From Science Daily ● Oct. 11, 2026

Visceral fat decreased among participants receiving the experimental injection but increased among those given the placebo.

From Science Daily ● Oct. 11, 2026

He then turned me on my side, and an injection took away my awareness of all that followed.

From "Tasting the Sky" by Ibtisam Barakat

Lethal injections ultimately represent an attempt to lessen people’s horror at state executions by dressing up the process to make it appear painless and humane.

From The Wall Street Journal ● Oct. 16, 2026

Cats are ideal companions for writers, whose lonely work can be alleviated by furry injections of playfulness and curiosity.

From The Wall Street Journal ● Oct. 16, 2026

Drugs for lethal injections are also hard to obtain because many pharmaceutical companies do not want to sell the medications to prisons for that use, since they were developed for life-saving purposes.

From BBC ● Oct. 12, 2026

The number of injections depended on how much abdominal fat each participant had.

From Science Daily ● Oct. 11, 2026

“Do you know he is afraid of injections? A whole General Officer Commanding and if he sees a needle, he is afraid!”

From "Americanah" by Chimamanda Ngozi Adichie

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Related Words

• dose
• needle

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