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

• edge in
• fit (in or into)
• insert
• insinuate
• intercalate
• interject
• interpolate
• interpose
• intersperse
• introduce
• sandwich (in or between)
• work in

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 predators use their pincers to grab prey before using their telson to stab their meal, injecting the prey with venom, National Geographic says. —Irene Wright, Miami Herald, 12 June 2025

Sly and the Family Stone released 10 studio albums between 1967 and 1982, with many songs injected with passionate social consciousness and others existing as blissful foot-stompers. —Melissa Ruggieri, USA Today, 10 June 2025

Trump used the excuse of anarchy and lawlessness on the street to inject the National Guard and the Marines into L.A., despite not being legally allowed to do so. —New York Daily News Editorial Board, New York Daily News, 10 June 2025

Lively Feud: Lively Shares ‘Gratitude’ On Instagram After Baldoni’s Lawsuit Is Dismissed Then, in February of this year, the court expanded that earlier injunction, injecting even more chaos and uncertainty into the federal student loan repayment system. —Adam S. Minsky, Forbes.com, 10 June 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