•
Injection (medicine), insertion of liquid into the body with a syringe •
Injective function, a mathematical function mapping distinct arguments to distinct values • 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 ==Arts, entertainment and media==