injection

plural injections

1. countableuncountableThe 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

   2010, Paul Shreve, David W. Townsend, Clinical PET-CT in Radiology: Integrated Imaging in Oncology, →ISBN, page 78

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

   The troubled business received a much-needed cash injection.

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

   Synonyms: injective function

7. countableuncountablecomputer 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. countableuncountablespaceThe 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.

   2015, Henry L. Richter, America's Leap Into Space

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

    conjunctival injection

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

    direct injection

    1 more example

    tuned port injection

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