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

Bam—an eccentric sneaker instantly injects your look with personality. —Christian Allaire, Vogue, 12 Nov. 2025

Moniz injected absolute alcohol into the frontal lobes of a mental patient through two holes drilled in the skull. —Scott Lafee, San Diego Union-Tribune, 11 Nov. 2025

The strategy has since been reinforced by Swiss private equity firm Evoco, which in October 2024 acquired the stake formerly held by Milano Investment Partners, and injected additional funds via a capital increase. —Sandra Salibian, Footwear News, 11 Nov. 2025

For instance, lack of sleep can make your body more resistant to insulin, which means insulin (produced naturally or injected) is less effective, resulting in higher blood sugars. —Beth Krietsch, SELF, 11 Nov. 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