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

The therapy is administered surgically, using a technique in which it is injected directly into the striatum, a part of the brain involved in cognitive, emotional and motor functions as well as certain processing. —Jacqueline Howard, CNN Money, 24 Sep. 2025

Chopping them down, injecting their bark with herbicide and spraying their stumps can prevent further growth and limit spread. —Sophie Hartley, IndyStar, 24 Sep. 2025

Designers leaned on crimson, scarlet, and cherry tones to inject energy into tailoring and dresses alike. —Essence, 24 Sep. 2025

Once bound, the virus can inject its genetic material (RNA in this case) into the cell, which is then transformed into a viral-making machine. —Tara Haelle, Scientific American, 23 Sep. 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