POSI - prim
- position of angle reference end point
- position of angle reference start point
- positional output action
- positive displacement flowmeter
- POSIX
- POSIX compliant version of DEC's VMS
- post
- post-process
- potable water
- POU
- pour point
- powder
- power distribution cabinet
- power distribution system
- power factor
- power fuse
- power supply unit
- ppm
- PR
- PRD
- pre-cast element
- pre-process
- pre-processing
- PREBSTS
- precipitation-evaporation ratio
- precision architecture reduced instruction set computing
- predicted leakage value
- preheat exchanger
- preheated
- preheater tank
- preliminary water discharge unit
- preset function
- preset manipulated output value
- preset MV switch
- preset offset voltage
- pressure casing
- pressure rod packing
- pressure swing adsorber
- pressure swing adsorption
- pressure switch
