injection

Meanings

1. 1
   noun

   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. 2
   noun

   The supply of additional funding to a person or a business.

   The troubled business received a much-needed cash injection.

3. 3
   noun

   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

4. 4
   noun

   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.

5. 5
   noun

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

   conjunctival injection

6. 6
   noun

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

   direct injection

7. 7
   noun

   the forceful insertion of a substance under pressure

8. 8
   noun

   the act of putting a liquid into the body by means of a syringe

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.