the act of injecting.

something that is injected.

a liquid injected into the body, esp. for medicinal purposes, as a hypodermic or an enema.

state of being hyperemic or bloodshot.

Mathematics . a one-to-one function.

Also called insertion. Aerospace . the process of putting a spacecraft into orbit or some other desired trajectory.

noun

booster , dose , dram , enema , inoculation , needle , vaccine