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

Also, Wise had said that one of the Nazis’ methods for killing Jews was to inject air bubbles into their veins, at the rate of up to a hundred people per hour, but a doctor in New Orleans told Julian that this was impossible. —Nicholas Lemann, New Yorker, 21 Feb. 2026

Instead, Trump’s vow to press ahead and use other authorities to make countries pay injected fresh uncertainty into an already fraught issue. —Barnini Chakraborty, The Washington Examiner, 21 Feb. 2026

The unprecedented tariff push by the administration injected new uncertainty into the clean energy transition by adding another layer of duties on top of existing equipment tariffs. —Chaewon Chung, Sacbee.com, 20 Feb. 2026

The Kings planned for Panarin to inject his vast offensive acumen and production into a lineup that included Fiala and Kempe, to boost a group that’s tied for 29th with the lowly Vancouver Canucks in goals per game. —Eric Stephens, New York Times, 19 Feb. 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