Application Programming Interface 
Application Program Interface 
Associate in Personal Insurance 
American Petroleum Institute 
Academic Performance Index 
Applications Program Interface 
Application Programmer's Interface 
Application Programming Interfaces 
Application Programmer Interface 
Active Pharmaceutical Ingredient 
Active Pharmaceutical Ingredients 
Antecedent Precipitation Index 
Applications Programming Interface 
Air Position Indicator 
American Paper Institute 
Armor Piercing Incendiary 
absolute position indication 
Advanced Publication of Information 
aerial photo interpretation 
air pollution index 
Aircraft Platform Interface 
American Pirate Industries 
Application Processor Interface 
Application Program Interfaces 
Application Programmers Interface 
Application Protocol Interface 
Arab Planning Institute 
Asian and Pacific Islander 
atmospheric pressure ionization 
Aviation Preflight Indoctrination