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

Ford, 64, is set to be executed by lethal injection after being on death row for more than two decades for the 1997 murders of Gregory and Kimberly Malnory, who were in their mid-20s. —Fernando Cervantes Jr., USA TODAY, 14 Feb. 2025

Richard Tabler shared his final words before he was executed by lethal injection in Texas on Thursday. —Josh Hammer, Newsweek, 14 Feb. 2025

Complications can also arise due to treatments, such as injections or surgery. —Mark Gurarie, Health, 13 Feb. 2025

The first location opened its doors in Geneva in 1997 with a focus on laser treatments, and the clinic has since expanded its purview to include botox and filler injections; facials and peels; body sculpting treatments, and cosmetic procedures including facelifts. —Noor Lobad, WWD, 13 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

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