inject

verb

in·​ject in-ˈjekt 

injected; injecting; injects

transitive verb

1

a

: to introduce into something forcefully

inject fuel into an engine

b

: to force a fluid into (as for medical purposes)

inject a drug into the bloodstream

2

: to introduce as an element or factor in or into some situation or subject

… condemning any attempt to inject religious bigotry into the campaign.

—Current Biography

injectable

in-ˈjek-tə-bəl 

adjective or noun

injector

in-ˈjek-tər 

noun

Synonyms of inject

• insert
• introduce

Examples of inject in a Sentence

She told a few jokes to inject a little humor into her speech.

We need to inject some life into this party.

Recent Examples on the Web

Following 2023’s Emotional Contracts, where producer Dave Fridmann injected a harder, radio-ready punch, Coin-O-Matic’s mellower Americana sound reflects a band at ease with itself, even when the tempos slacken and the organ gets buried in the mix. —Arman Khan, Pitchfork, 19 June 2026

The study introduces a novel fabrication method that injects a crosslinking agent during membrane formation to create highly efficient separating layers. —Mrigakshi Dixit, Interesting Engineering, 18 June 2026

The state has also been selling off company assets to inject cash directly into the factories that are still running. —Jasmin Malik Chua, Footwear News, 18 June 2026

Optimism over artificial intelligence has also injected a degree of uncertainty about the job market due to the investment required to develop it and because the powerful technology could alter or even replace some jobs. —Matt Ott, Los Angeles Times, 18 June 2026

Word History

Etymology

Latin injectus, past participle of inicere, from in- + jacere to throw — more at jet

First Known Use

1601, in the meaning defined at sense 1a

Rhymes for inject

• affect
• aspect
• bedecked
• bisect
• collect
• connect
• correct
• deflect
• detect
• direct
• dissect
• effect

Kids Definition

inject

verb

in·​ject in-ˈjekt 

1

a

: to throw, drive, or force into something

inject fuel into an engine

b

: to force a fluid into (a part of the body) especially for medical reasons

2

: to introduce as an additional element

injected humor into her speech

injectable

-ˈjek-tə-bəl 

adjective

injector

-ˈjek-tər 

noun

Medical Definition

inject

transitive verb

in·​ject in-ˈjekt 

1

: to force a fluid into (a vessel, cavity, or tissue) for preserving, hardening, or coloring structures

2

: to introduce (as by injection or gravity flow) a fluid into (a living body) especially for the purpose of restoring fluid balance, treating nutritional deficiencies or disease, or relieving pain

also : to treat (an individual) with injections