plural injections
1
: the act or process of forcing a liquid medicine or drug into someone or something by using a special needle
The medicine cannot be taken orally; it must be given/administered by injection.
Nurses give the injections.
an injection of a painkiller
2
: the act or process of forcing a liquid into something
an engine with fuel injection [=a system that injects fuel directly into the cylinders of an engine]
injections of fuel
3
: the addition of something (such as money) that is needed to support something
The struggling company needed an injection of cash.
Cite this Entry
“Injection.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/injection. Accessed 19 Jun. 2026.
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