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

The spacecraft will separate from the rocket after reaching what’s called a trans-lunar injection orbit, which is an elliptical path that extends about 236,000 miles (380,000 kilometers) above Earth. —Jackie Wattles, CNN, 26 Feb. 2025

Glossip nearly receives lethal injection Glossip has had nine separate execution dates scheduled and has nearly been executed several times. —Sean Murphy, Chicago Tribune, 25 Feb. 2025

An injection pen of Zepbound, Eli Lilly’s weight loss drug, is displayed in New York City on Dec. 11, 2023. —Annika Kim Constantino, CNBC, 25 Feb. 2025

Hoffman initially challenged Louisiana's lethal injection protocol in 2012 on the grounds that the method was cruel and unusual punishment. —CBS News, 24 Feb. 2025

Word History

First Known Use

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

Phrases Containing injection

• fuel injection
• hypodermic injection
• injection molding

Rhymes for injection

• abjection
• advection
• affection
• bijection
• bisection
• collection
• complexion
• confection
• connection
• connexion
• convection
• correction

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