Microgravity Measurement Assembly 
Medicare Modernization Act 
Multimission Maritime Aircraft 
Mathematical Modelling and Analysis 
Mobile Marketing Association 
Montreal, Maine and Atlantic Railway 
Malaysian Medical Association 
Manual metal arc 
Mass Memory Assembly 
Mastitis-metritis-agalactia complex 
Meet me at 
Module Manager Application 
Money Market Account 
MSFC Management Association 
multiple module access 
Multiplexer Mating Adapter 
Magnetosensitive Microwave Absorption 
Maine Maritime Academy 
Mainframe Migration Alliance 
Major Mailers Association 
Major Maintenance Availability 
male mating ability 
Manitoba Medical Association 
Marine Managed Area 
Marine Military Academy 
Maritime Museum of the Atlantic 
Martin Marietta Aerospace 
Massachusetts Maritime Academy 
Massachusetts Motorcycle Association 
Massanutten Military Academy