The meaning of the Acronym PD is...

PD is

• Personal Defense
• Prison Delivery

More Meanings For PD:

• Participatory Design
• Projective Dimension
• Pressure Down
• Pipe Duct
• Production Drawing
• Palladium
• Phase-change Device
• Projective Dimension
• Propagation Delay
• Polarization Difference
• Poincare Duality
• Please Dad
• Partial Derivative
• Prisoner's Dilemma
• Project Director

PD is also in:

• Architecture
• Chemistry
• Mathematics
• Meteorology
• Physics
• Universities