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
Side effects were mostly limited to redness and swelling at the injection site.
—
Aria Bendix, NBC news, 26 Dec. 2025
But injections will still cost between $4,000 and $6,000 a year — a figure that remains out of reach for the many Americans for whom insurance coverage is not an option.
—Tom Gavin, EverydayHealth.com, 24 Dec. 2025
Although some patients dislike needles, others don't seem to mind the weekly injections, obesity experts said.
—CBS News, 23 Dec. 2025
Pain medications, steroid injections, or even knee replacement surgery have dominated the treatment landscape for ages.
—Lyssanoel Frater, USA Today, 23 Dec. 2025
See All Example Sentences for injection
Examples are automatically compiled from online sources to
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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Aria Bendix, NBC news, 26 Dec. 2025
But injections will still cost between $4,000 and $6,000 a year — a figure that remains out of reach for the many Americans for whom insurance coverage is not an option.
—Tom Gavin, EverydayHealth.com, 24 Dec. 2025
Although some patients dislike needles, others don't seem to mind the weekly injections, obesity experts said.
—CBS News, 23 Dec. 2025
Pain medications, steroid injections, or even knee replacement surgery have dominated the treatment landscape for ages.
—Lyssanoel Frater, USA Today, 23 Dec. 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 31 Dec. 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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