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

This capital injection comes at a pivotal moment for Incentify, which has already established partnerships with major global organizations including Amazon, Kroger, Cargill, Tyson, Sony Pictures, and Paramount Studios, as well as thousands of small and medium-sized businesses. —Josipa Majic Predin, Forbes.com, 3 Apr. 2025

Thirty minutes after their first taste, the mice received a one-time injection which caused a temporary food poisoning-like illness. —Laura Baisas, Popular Science, 2 Apr. 2025

Jeffrey Hutchinson, 59, is set to die by lethal injection May 1 at Florida State Prison near the city of Starke. —Curt Anderson, Sun Sentinel, 1 Apr. 2025

Lilly’s weekly injections Zepbound and Mounjaro will cost patients $1,899 a month, according to the Hims & Hers website. —Ashley Capoot, CNBC, 1 Apr. 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