Injection

• Injective function, a mathematical function mapping distinct arguments to distinct values
• Injection (medicine), insertion of liquid into the body with a syringe
• Injection, in broadcasting, the level at which a subcarrier is sent by the transmitter, expressed as a percent of total modulation
• Injection quill, used in the petrochemical industry to insert chemicals, typically inhibitors, for proper mixture within a base chemical
• Fuel injection, a means of metering fuel into an internal combustion engine
• Orbit injection, changing a stable orbit into a transfer orbit
• Injection, in construction, insertion of consolidation materials (i.e., cement grout mixtures, gravel) by means of dry type rotary shortcrete high pressure pumps
• Injection well
• Injection moulding, a technique for making parts from plastic material

Computing

• Code injection, a security violation technique using unexpected program modification
• Dependency injection, a programming design pattern, also referred to as inversion of control
• Email injection, a security violation technique using web email forms
• Fault injection, a software testing technique
• Network injection, an attack on access points that are exposed to non-filtered network traffic
• SQL injection, a security violation technique using database commands

• Injected (album), a 1995 album by Phunk Junkeez
• Injected (band), a rock band from Atlanta, Georgia
• Injection (comics), an Image Comics science fiction series by Warren Ellis and Declan Shalvey
• "Injection", song by Rise Against from The Sufferer & the Witness, 2006

• Injection (economics), a financial boost to an economy
• Drug injection of recreational drugs

• Injunction
• Interjection