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
The injection process takes only 15 to 20 minutes.
—
Nicole Fallert, USA Today, 19 Sep. 2025
Advocacy groups have also raised concerns, noting Arizona's troubled history with executions, including a series of botched lethal injections that led to an eight-year pause before the state resumed the practice in 2022.
—Alia Shoaib, MSNBC Newsweek, 19 Sep. 2025
Accordingly, OpenAI mitigated the prompt-injection technique ShadowLeak fell to—but only after Radware privately alerted the LLM maker to it.
—Dan Goodin, ArsTechnica, 18 Sep. 2025
That means kids who get free vaccines through the federal program will still be able to choose between a single combination shot or two separate injections for their first vaccination.
—Brenda Goodman, CNN Money, 18 Sep. 2025
See All Example Sentences for injection
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show current usage.
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Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
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Nicole Fallert, USA Today, 19 Sep. 2025
Advocacy groups have also raised concerns, noting Arizona's troubled history with executions, including a series of botched lethal injections that led to an eight-year pause before the state resumed the practice in 2022.
—Alia Shoaib, MSNBC Newsweek, 19 Sep. 2025
Accordingly, OpenAI mitigated the prompt-injection technique ShadowLeak fell to—but only after Radware privately alerted the LLM maker to it.
—Dan Goodin, ArsTechnica, 18 Sep. 2025
That means kids who get free vaccines through the federal program will still be able to choose between a single combination shot or two separate injections for their first vaccination.
—Brenda Goodman, CNN Money, 18 Sep. 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 22 Sep. 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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