Automated Data Processing 
Automatic Data Processing 
Administrative Data Processing 
Advanced Data Processing 
Acceptance Data Package 
Air Defense Plan 
Automatic Data Processor 
adenosine diphosphate 
AHERA Designated Person 
Arrow Deployability Project 
Astrophysics Data Program 
Accelerated Demining Program 
Adapter 
adenosine 5'-diphosphate 
Advanced Development Program 
Advanced Development Programs 
advanced ducted propfan 
Air Data Probe 
Air Defense Position 
Air Driven Pump 
Alternative Delivery Procedure 
Ammonium Dihydrogen Phosphate 
Andorran Peseta 
Arrow Deployability Program 
Auger depth profiling 
automated data process 
Average Daily Population 
Acceptance Data Packages 
Access Data Pages 
Access Database Project