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

Mills, 50, was pronounced dead at 6:26 p.m. local time after a three-drug injection at the William C. Holman Correctional Facility in southwest Alabama, the state's Department of Corrections said in a statement. —Emily Mae Czachor, CBS News, 30 May 2024

Recent shortages of single injection penicillin needed to treat this infection threatens to make matters worse. —Jacob D. Moses and Allan M. Brandt, STAT, 30 May 2024

Idaho Attorney General Raúl Labrador and Ada County Prosecutor Jan Bennetts, who is up for re-election, attended Creech’s planned lethal injection. —Kevin Fixler, Idaho Statesman, 29 May 2024

An epidural steroid injection (ESI) delivers a combination of anesthetics and steroids into the epidural space. —Samantha Lauriello, Health, 26 May 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