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See also: înjection


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An injection


  • IPA(key): /ɪn.ˈdʒɛk.ʃən/
  • Hyphenation: in‧jec‧tion
  • Rhymes: -ɛkʃən


Borrowed from Middle French injection, from Latin iniectio.


injection (plural injections)

  1. The act of injecting, or something that is injected.
  2. (specifically, medicine) Something injected subcutaneously, intravenously, or intramuscularly by use of a syringe and a needle.
  3. (set theory) A function that maps distinct x in the domain to distinct y in the codomain; formally, a fX → Y such that f(a) = f(b) implies a = b for any a, b in the domain.
  4. (mathematics) A relation on sets (X,Y) that associates each element of Y with at most one element of X.
  5. (figuratively) The addition of money to someone, or to a business.
    The troubled business received a much-needed cash injection.
  6. (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.
    a SQL injection exploit allowing a malicious user to modify a database query
  7. A specimen prepared by injection.
  8. (steam engines) The act of throwing cold water into a condenser to produce a vacuum.
  9. (steam engines) The cold water thrown into a condenser to produce a vacuum.
  10. (category theory) A morphism from either one of the two components of a coproduct to that coproduct.
  11. (construction) The act of inserting materials like concrete grout or gravel by using high pressure pumps.
  12. 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


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Borrowed from Latin iniectiō, iniectiōnem.


injection f (plural injections)

  1. injection

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