injection (injections plural )
1 n-count If you have an injection, a doctor or nurse puts a medicine into your body using a device with a needle called a syringe.
also by N
They gave me an injection to help me sleep...
2 n-count An injection of money or resources into an organization is the act of providing it with more more money or resources, to help it become more efficient or profitable. (BUSINESS) with supp, oft N of n An injection of cash is needed to fund some of these projects...
fuel injection
Fuel injection is a system in the engines of some vehicles which forces fuel directly into the part of the engine where it is burned. n-uncount