99 PDP definitions

Professional Development Program 
Packet Data Protocol 
Policy Decision Point 
Plasma Display Panel 
Programmed Data Processor 
Parallel Data Processing 
Plasma Diagnostic Package 
Plasma Diagnostics Package 
Postinsertion Deorbit Preparation 
program definition phase 
Personal Development Plan 
Power Distribution Panel 
Process Development Pile 
Program Development Plan 
Project Definition Phase 
Project Development Plan 
Parallel Distributed Processing 
Peripheral Data Processing 
Pesticide Data Program 
Polar Data Processing 
Policy Development Process 
positive displacement pump 
Power Delay Profile 
Preliminary Definition Plan 
Prescription Drug Plan 
Procedure Definition Processor 
Procurement Data Package 
product development protocol 
Professional Development Plan 
Program Decision Package