injection

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See also: înjection

English

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An injection (relation on sets in mathematics)

Etymology

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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.

Pronunciation

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Noun

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injection (countable and uncountable, plural injections)

  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.
    Synonym: injective function
  7. (computer security) 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. (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.
    • 2015, Henry L. Richter, America's Leap Into Space:
      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. (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. (medicine) Something injected subcutaneously, intravenously, or intramuscularly by use of a syringe and a needle.
  11. (medicine) Congestion (of a body part, with blood or other fluid), such as hyperemia.
    conjunctival injection
  12. (internal combustion engines) Fuel injection: the pressurized introduction of fuel into a cylinder.
    direct injection
    tuned port injection
  13. (steam engines) The act of throwing cold water into a condenser to produce a vacuum.
  14. (steam engines) The cold water thrown into a condenser to produce a vacuum.

Hyponyms

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(computer security) Insertion of program code into an application, URL, etc.
(construction)

Derived terms

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(construction) Terms derived from injection
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Translations

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See also

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References

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French

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Etymology

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Borrowed from Latin iniectiōnem.

Pronunciation

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Noun

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injection f (plural injections)

  1. injection
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Descendants

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  • → Romanian: injecție
  • → Turkish: enjeksiyon

Further reading

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