Application Programming Interface 
Application Program Interface 
American Petroleum Institute 
Academic Performance Index 
Applications Program Interface 
armor piercing incendiary 
active pharmaceutical ingredient 
Air Position Indicator 
antecedent precipitation index 
Application Programming Interfaces 
atmospheric pressure ionization 
absolute position indication 
active pharmaceutical ingredients 
Advance Passenger Information 
Advanced Publication of Information 
aerial photo interpretation 
air pollution index 
American Paper Institute 
Applications Programming Interface 
Arab Planning Institute 
Associate in Personal Insurance 
A Pleasing Interface 
Absolute Position Indicator 
Academic Program Inventory 
Accountable property inventory 
Accountants for the Public Interest 
Achromobacter protease I 
Acquisition Program Integration 
Active Pharmacetical Ingredients 
Active Pharmaceutical Ingrediences