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

• 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

Why the Trend Is Growing But the reach of CGMs is no longer limited to those who inject insulin. —Daryl Austin, Forbes.com, 21 Aug. 2025

Castellanos is a dual threat and should inject some life into a dormant offense especially after an entire offseason working with new offensive coordinator Gus Malzahn. —Andre Fernandez, Miami Herald, 21 Aug. 2025

Google on Wednesday unveiled a new line-up of Pixel smartphones injected with another dose of artificial intelligence that’s designed to do everything from fetch vital information stored on the devices to help improve photos as they’re being taken. —Michael Liedtke, Fortune, 20 Aug. 2025

And Downtown Westminster’s growth has begun to inject life into surrounding retail centers, the councilwoman said, most notably with last month’s opening of a Trader Joe’s grocery store just to the northeast of the downtown zone — the trendy chain’s ninth location in Colorado. —John Aguilar, Denver Post, 18 Aug. 2025

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