injection
noun
in·jec·tion
in-ˈjek-shən 
1
a
: an act or instance of injecting
b
: the placing of an artificial satellite or a spacecraft into an orbit or on a trajectory
also
: the time or place at which injection occurs
2
: something (such as a medication) that is injected
3
: a mathematical function that is a one-to-one mapping compare bijection, surjection
Examples of injection in a Sentence
The medicine cannot be taken orally; it must be given by injection.
an injection of a painkiller
The struggling company needed an injection of cash.
Recent Examples on the Web
Moral stain aside, does anyone think such an injection of campus-style activism into the practical business of running the world's financial capital would actually benefit the median New Yorker?
—
MSNBC Newsweek, 31 Oct. 2025
Wuornos, who was found guilty of six murders and received six death sentences, was executed by lethal injection on October 9, 2002, after a decade on death row.
—Jason Pham, StyleCaster, 31 Oct. 2025
Wuornos was executed by lethal injection in October 2002, according to a New York Times obituary.
—Allison Degrushe, Entertainment Weekly, 31 Oct. 2025
Although the percentage of those who experience side effects is not well documented or understood, fewer than 25% of spas analyzed in the JAMA report cite the potential for side effects to customers ahead of their injections.
—Alexa Mikhail, Flow Space, 30 Oct. 2025
See All Example Sentences for injection
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MSNBC Newsweek, 31 Oct. 2025
Wuornos, who was found guilty of six murders and received six death sentences, was executed by lethal injection on October 9, 2002, after a decade on death row.
—Jason Pham, StyleCaster, 31 Oct. 2025
Wuornos was executed by lethal injection in October 2002, according to a New York Times obituary.
—Allison Degrushe, Entertainment Weekly, 31 Oct. 2025
Although the percentage of those who experience side effects is not well documented or understood, fewer than 25% of spas analyzed in the JAMA report cite the potential for side effects to customers ahead of their injections.
—Alexa Mikhail, Flow Space, 30 Oct. 2025
See All Example Sentences for injection
Cite this Entry
“Injection.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/injection. Accessed 2 Nov. 2025.
Copy CitationKids Definition
injection
noun
in·jec·tion
in-ˈjek-shən
1
: an act or instance of injecting
2
: something (as a medical drug) that is injected
Medical Definition
injection
noun
in·jec·tion
in-ˈjek-shən
1
a
: the act or an instance of injecting a drug or other substance into the body
b
: a solution (as of a drug) intended for injection (as by catheter or hypodermic syringe) either under or through the skin or into the tissues, a vein, or a body cavity
c
: an act or process of injecting vessels or tissues
also
: a specimen prepared by injection
2
: the state of being injected : congestion see circumcorneal injection
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