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

The result is an aesthetic that skillfully balances a variety of textures, including injecting Shou Sugi Ban custom treatments inspired by Japanese principles of wabi-sabi that typically employ elements of asymmetry, roughness, and simplicity. —Rachel Davies, Architectural Digest, 12 June 2026

This would instantly solve Greenland’s security dilemma and inject massive American infrastructure investment into the domestic economy, replacing Danish financial dependence with American strategic partnership. —Barry Scott Zellen, Hartford Courant, 12 June 2026

Simultaneously, Warren Buffett’s Berkshire Hathaway has agreed to a private placement, injecting $10 billion by purchasing equal $5 billion tranches of Class A and Class C stocks. —Arthur Zaczkiewicz, Footwear News, 12 June 2026

Underneath Carrey’s wild performance, the actor was keen to inject an unlikely slice of empathy into a very flawed character. —Simon Bland, IndieWire, 12 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