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 gene therapy involves removing the patient’s stem cells, sending them to a lab at Great Ormond Street Hospital (GOSH) in London for modification, and replacing the faulty gene by re-injecting the modified cells. —Vanessa Etienne, PEOPLE, 26 Nov. 2025

In 2025, the state and city injected $570 million into the program, including a pilot initiative providing free care in select high-need neighborhoods. —Aliss Higham, MSNBC Newsweek, 26 Nov. 2025

In Nashville and across the state and country, naloxone, commonly known by the name brand Narcan, comes in forms that can be administered through the nose or injected in the thigh, often quickly bringing an overdose victim back to life. —Beth Warren, Nashville Tennessean, 25 Nov. 2025

There are some hairy moments, however, that might cause kids to worry − early on, one animal gets fanged and later on a couple are injected with deadly venom. —Brian Truitt, USA Today, 25 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