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

Surgeons typically inject hydrogels to prevent scarring, but injections are hard to control in the narrow throat. —Aamir Khollam, Interesting Engineering, 29 Oct. 2025

The procedure involves injecting a local anesthetic into a cluster of nerves in the neck that could potentially regulate the sympathetic nervous system. —Matt Emma, USA Today, 29 Oct. 2025

The medications are injected in the thigh or stomach. —Cara Lynn Shultz, PEOPLE, 29 Oct. 2025

The interactive web report predicts fusion has the potential to support more than 40,000 jobs and inject as much as $125 billion into California’s economy in the next decade. —Rob Nikolewski, San Diego Union-Tribune, 29 Oct. 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