injection

noun

1. The act of injecting, or something that is injected.

2. A specimen prepared by injection.

3. category theoryA morphism from either one of the two components of a coproduct to that coproduct.

4. constructionThe act of inserting materials like concrete grout or gravel by using high pressure pumps.

5. figurativelyThe supply of additional funding to a person or a business.

   “The troubled business received a much-needed cash injection.”

6. mathematicsA relation on sets (X,Y) that associates each element of Y with at most one element of X.

7. computer securityThe insertion of program code into an application, URL, hardware, etc.; especially when malicious or when the target is not designed for such insertion.

   “a SQL injection exploit allowing a malicious user to modify a database query”

8. spaceThe 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 theoryA 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. medicineSomething injected subcutaneously, intravenously, or intramuscularly by use of a syringe and a needle.

11. medicineCongestion (of a body part, with blood or other fluid), such as hyperemia.

    “conjunctival injection”

12. internal combustion enginesFuel injection: the pressurized introduction of fuel into a cylinder.

    “direct injection”

    “tuned port injection”

13. steam enginesThe act of throwing cold water into a condenser to produce a vacuum.

14. steam enginesThe cold water thrown into a condenser to produce a vacuum.