An Injection

1. The act of injecting, or something that is injected.
2. A specimen prepared by injection.
3. (category theory) A morphism from either one of the two components of a coproduct to that coproduct.
4. (construction) The act of inserting materials like concrete grout or gravel by using high pressure pumps.
5. (figuratively) The supply of additional funding to a person or a business.The troubled business received a much-needed cash injection.
6. (mathematics) A relation on sets (X,Y) that associates each element of Y with at most one element of X.
7. (programming) The insertion of program code into an application, URL, hardware, etc.; especially when malicious or when the target is not designed for such insertion.
8. (space science) The act of putting a spacecraft into a particular orbit, especially for changing a stable orbit into a transfer orbit, e.g. trans-lunar injection.
9. (set theory) A function that maps distinct x in the domain to distinct y in the codomain; formally, a f: X → Y such that f(a) = f(b) implies a = b for any a, b in the domain.
10. (specifically, medicine) Something injected subcutaneously, intravenously, or intramuscularly by use of a syringe and a needle.
11. (steam engines) The act of throwing cold water into a condenser to produce a vacuum.
12. (steam engines) The cold water thrown into a condenser to produce a vacuum.