injection

noun

in·​jec·​tion in-ˈjek-shən 

1

a

: an act or instance of injecting

b

: the placing of an artificial satellite or a spacecraft into an orbit or on a trajectory

also : the time or place at which injection occurs

2

: something (such as a medication) that is injected

3

: a mathematical function that is a one-to-one mapping compare bijection, surjection

Examples of injection in a Sentence

The medicine cannot be taken orally; it must be given by injection.

an injection of a painkiller

The struggling company needed an injection of cash.

Recent Examples on the Web

Analysts surveyed by the Wall Street Journal had predicted net injections of 2 Bcf. —WSJ, 22 Nov. 2023

Out of 37 patients at Jefferson Health who received the procedure and followed up with doctors afterward, 22 reported that their smell distortion had improved one week after the injection. —Aria Bendix, NBC News, 20 Nov. 2023

The second week of injections was when things started to change. —Paige Stables, Allure, 16 Nov. 2023

The company said Wednesday in a news release that the medication, administered with an injection pen, will be sold at a cheaper list price than its semaglutide competitors from Novo Nordisk, which are branded as Wegovy for weight loss and Ozempic for diabetes. —Alexander Tin, CBS News, 8 Nov. 2023

Overall, the benefits of even a single ketamine injection occur rapidly, but are modest in magnitude. —C. Michael White, The Conversation, 8 Nov. 2023

Here’s how prompt injection works and the potential fallout of a real-world attack. —Tatum Hunter, Washington Post, 2 Nov. 2023

Then came a twice-yearly RNA injection that prevents PCSK9 from being made. —Gina Kolata, New York Times, 12 Nov. 2023

In July the state executed James Barber, 64, using a three-drug lethal injection. —Emily Palmer, Peoplemag, 3 Nov. 2023

See More

Word History

First Known Use

15th century, in the meaning defined at sense 1a

Phrases Containing injection

• fuel injection
• hypodermic injection
• injection molding

• fuel injection
• hypodermic injection
• injection molding

Kids Definition

injection

noun

in·​jec·​tion in-ˈjek-shən 

1

: an act or instance of injecting

2

: something (as a medical drug) that is injected

Medical Definition

injection

noun

in·​jec·​tion in-ˈjek-shən 

1

a

: the act or an instance of injecting a drug or other substance into the body

b

: a solution (as of a drug) intended for injection (as by catheter or hypodermic syringe) either under or through the skin or into the tissues, a vein, or a body cavity

c

: an act or process of injecting vessels or tissues

also : a specimen prepared by injection

2

: the state of being injected : congestion see circumcorneal injection