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

Since their complete takeover, and up to the most recent set of accounts published on Companies House for the year ended May 31, 2024, the Kroenkes have injected £329m into the club via shareholder loans. —Dan Sheldon, New York Times, 4 Sep. 2025

Lecanemab, sold under the brand name Leqembi—which the FDA approved in 2023 as the first medication to treat the memory disorder—is now available in a self-injecting pen, Leqembi Iqlik. —Alice Park, Time, 3 Sep. 2025

The nautical cardigan The preppy trend is riding high for fall 2025, which means injecting a bit of knitwear with nautical notes into your everyday wear only makes sense. —Kristina Rutkowski, Glamour, 3 Sep. 2025

On the other hand, advocates believe that golden visa programs inject money into thirsty economies. —Alex Ledsom, Forbes.com, 3 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