inject
1 Americanverb (used with object)
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injects,
present (3rd person singular)
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injected,
past participle, past
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injecting
present participle
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to force (a fluid) into a passage, cavity, or tissue.
to inject a medicine into the veins.
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to introduce (something new or different).
to inject humor into a situation.
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to introduce arbitrarily or inappropriately; intrude.
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to interject (a remark, suggestion, etc.), as into conversation.
abbreviation
verb
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med to introduce (a fluid) into (the body of a person or animal) by means of a syringe or similar instrument
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(foll by into) to introduce (a new aspect or element)
to inject humour into a scene
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to interject (a comment, idea, etc)
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to place (a rocket, satellite, etc) in orbit
Other Word Forms
Derived Forms
Inflected Forms
Participles
Conjugated Forms
Present
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injectsimple
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injectssimple
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have injectedperfect
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has injectedperfect
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am injectingprogressive
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are injectingprogressive
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is injectingprogressive
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have been injectingperfect progressive
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has been injectingperfect progressive
Past
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injectedsimple
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had injectedperfect
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was injectingprogressive
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were injectingprogressive
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had been injectingperfect progressive
Future
Etymology
Origin of inject1
First recorded in 1590–1600; from Latin injectus, past participle of in(j)icere “to throw in,” equivalent to in- “in” + -jec- (combining form of jac- “to throw”) + -tus past participle suffix; see in- 2
Origin of inject.2
From the Latin word injectiō
Explanation
To inject is to give an injection, or a shot. When your doctor tells you that you need a flu shot, she wants to inject you with a vaccine that will help keep you from getting sick. You are most likely to hear the verb inject at the doctor's office. Veterinarians inject dogs each year with rabies vaccines, and sometimes if you're sick enough, a doctor or nurse might need to inject you with antibiotics. You can use inject in a figurative way, too: "I'd like to inject a new topic into this conversation, it's getting so boring." The Latin root is inicere, "to throw in" or "to throw on."
Vocabulary lists containing inject
Vocabulary from the Poem “Touchscreen” by Marshall Davis Jones
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Latin Love, Vol II: iacere
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The Night Diary
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
Bring them up, inject some fire into this lineup, and let the kids play.
From Los Angeles Times ● Aug. 29, 2026
"That methane we use as a fuel for engines that run generators and the generators produce electricity - and we then inject the electricity back into the National Grid," he explained.
From BBC ● Aug. 27, 2026
To inject life into the center, Gary tapped architects from the University of Notre Dame, in South Bend, Ind., to help draft redevelopment plans.
From The Wall Street Journal ● Aug. 4, 2026
His purpose was to simply "inject as much joy and silliness into the world as he could and he was doing it right until the end," he added.
From BBC ● Aug. 4, 2026
Mosquitoes of the genus Anopheles may inject into the human bloodstream the single-celled organism of malaria.
From "Silent Spring" by Rachel Carson
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The company’s sell-down at Simberi injects enough cash to fund the sulfide expansion while progressing the Touqyoy and 15-Mile Hub growth projects, the analysts say.
From The Wall Street Journal ● Aug. 11, 2026
Now she injects insulin twice a day, monitors what she eats, and despite missing the spontaneity of her old life, is learning to adapt to her new one.
From BBC ● Aug. 8, 2026
It also injects a bit of saliva, which contains anticoagulants to prevent the host’s blood from clotting as the mosquito feeds.
From Slate ● Aug. 4, 2026
During the procedure, an interventional radiologist uses a thin catheter to reach the affected blood vessels and injects tiny particles that block blood flow to them.
From Science Daily ● Jun. 17, 2026
The heat of her fingertips injects me with confidence.
From "Like Vanessa" by Tami Charles
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"The patients have no idea how much they have been taking, or even what they've been injected with."
From BBC ● Sep. 4, 2026
And shares in MediaTek soared nearly 10 percent after US tech giant Nvidia announced it has injected US$3.5 billion into the Taiwanese chipmaker.
From Barron's ● Sep. 1, 2026
When the bacteria are injected systemically, they are cleared from healthy tissues with abundant oxygen.
From Science Daily ● Aug. 19, 2026
A few months ago, Pinchas Cohen learned of a thriving online trade in MOTS-c — a peptide that, when injected into mice, seems to mimic the effects of exercise.
From Los Angeles Times ● Aug. 6, 2026
A mouse injected with the smooth strain thus died rapidly of pneumonia.
From "The Gene" by Siddhartha Mukherjee
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So far, researchers have tested the treatment in mouse models by injecting the material directly into the damaged area of the brain.
From Science Daily ● Sep. 4, 2026
Most common by far is injecting the gel-like substance hyaluronic acid - the same key ingredient used in lip fillers.
From BBC ● Aug. 15, 2026
The process of hydraulic fracturing ekes out oil from older wells, and involves cracking the bedrock several thousand feet below the seafloor by injecting chemical fluids with intense pressure.
From Los Angeles Times ● Aug. 14, 2026
He entered the race in May, injecting uncertainty into a contest that had long appeared to be Hichilema's to lose.
From Barron's ● Aug. 14, 2026
It wasn’t until 1828 that an enterprising Scot named James Neilson had the simple but effective idea of injecting heated air rather than cold air into an iron furnace by means of a bellows.
From "A Walk in the Woods" by Bill Bryson
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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.