The meaning of the Acronym PID is...

PID is

• Poor Innocent Dragon

More Meanings For PID:

• Process ID file (Unix)
• Physical Interface Device
• Packet Identifier Digital
• Personal Identity Digit
• Process IDentifier
• Proportional Integral Derivative
• Proportional Integral Derivative
• Principal Ideal Domain
• Parameter Identication Data
• Plastics Information Direct
• Poor Innocent Dragon
• Past International Director
• Pelvic inflammatory disease
• Prolapsed Intervertebral Disc
• Poughkeepsie Inflamatory Disease

PID is also in:

• Electronics
• File Extensions
• Hardware
• Mathematics
• Physics
• Physiology
• Plastics
• Science Fiction
• Security
• Software
• Toastmasters