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

In 2024, Addis Ababa opened its banking sector to foreigners for the first time in 50 years, aiming to inject international capital into a historically closed and credit-starved market of 100 million people. — Tiisetso Motsoeneng, semafor.com, 22 July 2026

When a fetus is identified as having the high-risk gene mutation, a harmless virus carrying a healthy copy of the encoding gene is injected directly into the umbilical vein. — William A. Haseltine, Forbes.com, 22 July 2026

But many doctors are alarmed by a craze that has thousands of people injecting themselves with substances of dubious origin and whose long-term effects are unknown. — The Week Us, TheWeek, 20 July 2026

Peptides—the tiny protein fragments that users inject to try to speed up recovery, boost energy, or slow aging—are all the rage. — Lily Mae Lazarus, Fortune, 20 July 2026

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