injection

noun

Etymology: Borrowed from Middle French injection, from Latin iniectio. The mathematical sense is from French injection, introduced by Nicolas Bourbaki in their treatise Éléments de mathématique. Equivalent to inject + -ion.

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

   “For some indications in PET imaging, it is necessary for radiopharmaceutical injections to be administered contralaterally or pedally to the disease process”

2. A specimen prepared by injection.
3. A morphism from either one of the two components of a coproduct to that coproduct.
4. The act of inserting materials like concrete grout or gravel by using high pressure pumps.
5. The supply of additional funding to a person or a business.

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

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

   “It had been determined that one of the whip turnstile antennas had broken off from Explorer 1 shortly after injection into orbit, so these were eliminated.”

9. 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. Something injected subcutaneously, intravenously, or intramuscularly by use of a syringe and a needle.
11. Congestion (of a body part, with blood or other fluid), such as hyperemia.

    “conjunctival injection”

12. Fuel injection: the pressurized introduction of fuel into a cylinder.

    “direct injection”

    “tuned port injection”

13. The act of throwing cold water into a condenser to produce a vacuum.
14. The cold water thrown into a condenser to produce a vacuum.