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
Its team continued to win and the injection of television exposure and dollars beginning in 1949 and growing from there expanded the school’s brand even more.
—
Hunter M. Hampton / Made By History, TIME, 9 Jan. 2025
As the name implies, these injections block TNFs, which are proteins that cause inflammation.
—Brittany Risher, SELF, 8 Jan. 2025
The trial, involving more than 5,000 women, found the twice-yearly injections provided 100% protection against HIV.
—James K. Glassman, Boston Herald, 6 Jan. 2025
The cash injection couldn’t have come at a better time.
—Kyle Khan-Mullins, Forbes, 6 Jan. 2025
See all Example Sentences for injection 
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Hunter M. Hampton / Made By History, TIME, 9 Jan. 2025
As the name implies, these injections block TNFs, which are proteins that cause inflammation.
—Brittany Risher, SELF, 8 Jan. 2025
The trial, involving more than 5,000 women, found the twice-yearly injections provided 100% protection against HIV.
—James K. Glassman, Boston Herald, 6 Jan. 2025
The cash injection couldn’t have come at a better time.
—Kyle Khan-Mullins, Forbes, 6 Jan. 2025
See all Example Sentences for injection
Dictionary Entries Near injection
Cite this Entry
“Injection.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/injection. Accessed 18 Jan. 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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