Multi-Purpose Additive 
Magazine Publishers Association 
Management Professionals Association 
Management Protocol Adaptors 
Manufacturing and Process Automation 
Marketing and Promotion Association 
Massage Parlor Attendant 
Master of Public Affairs 
Master Photographers Association 
Maximum Permissible Amount 
Mechanical Packing Association 
Medium-Pressure Air 
Metal Powder Association 
Microwave-Plasma-Assisted 
Mortar Producers Association 
Mouse Protective Antigen 
Multi-Period Average 
Multiple Peripheral Adapter 
Multiple-Photon Absorption 
Music Publishers Association 
Manufacturing Producibility Analysis 
Miniature Pendulum Accelerometer