- PID is defined as an abbreviation for pelvic inflammatory disease, a painful illness that causes inflammation in a woman's genital tract.
An example of PID is the result of when sexually transmitted diseases move upwards into a woman's reproductive organs.
pid - Computer Definition
(1) (Process IDentifier) A temporary number assigned by the operating system to a process or service.
(2) (Proportional-Integral-Derivative) The most common control methodology in process control. It is a continuous feedback loop that keeps the process flowing normally by taking corrective action whenever there is any deviation from the desired value ("setpoint") of the process variable (rate of flow, temperature, voltage, etc.). An "error" occurs when an operator manually changes the setpoint or when an event (valve opened, closed, etc.) or a disturbance changes the load, thus causing a change in the process variable. The PID controller receives signals from sensors and computes corrective action to the actuators from a computation based on the error (proportional), the sum of all previous errors (integral) and the rate of change of the error (derivative). See PAC.