injection

noun

• 1an instance of injecting or being injected:painkilling injections an injection of capital was needed
• a thing that is injected:a morphine injection
• [mass noun] the action of injecting:the walls have been damp-proofed by injection
• short for fuel injection.

• 2 [mass noun] the entry or placing of a spacecraft or other object into an orbit or trajectory.

• 3 Mathematics a one-to-one mapping.