A conduit made of pipes used to convey water, gas or petroleum etc.
An oil pipeline has been opened from the Caspian Sea.
A channel (either physical or logical) by which information is transmitted sequentially (that is, the first information in is the first information out).
3D images are rendered using the graphics pipeline.
A system or process through which something is conducted.
A new version of the software is in the pipeline, but has not been rolled out.
The inside of a wave that a surfer is riding, when the wave has started closing over it.