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

Wrangling over South Carolina’s access to lethal injection drugs led McMaster to sign a law in 2021 allowing the state to also execute by electrocution or firing squad, with death row inmates given the choice. —Andy Rose, CNN, 31 Oct. 2024

Immediate treatment for anaphylaxis is often necessary and typically requires an epinephrine injection. —Lana Barhum, Verywell Health, 31 Oct. 2024

South Carolina inmate Richard Moore was executed by lethal injection on Friday for the 1999 murder of a convenience store clerk, despite widespread appeals for clemency. —Marco Rubio, Newsweek, 2 Nov. 2024

South Carolina put Richard Moore to death by lethal injection Friday for the 1999 fatal shooting of a convenience store clerk, despite a broad appeal for mercy by parties that included three jurors and the judge from his trial, a former prison director, pastors and his family. —CBS News, 1 Nov. 2024

Word History

First Known Use

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

Phrases Containing injection

• 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