121 MTA definitions

Message Transfer Agent 
Major Trading Area 
Mail Transfer Agent 
Message Transfer Agents 
Metropolitan Transportation Authority 
Major Trading Areas 
Mail Transfer Agents 
Maryland Transit Administration 
Material Transfer Agreement 
Macintosh telephony architecture 
Mail Transport Agent 
Maintenance Task Analysis 
Major Training Area 
Mass Transit Authority 
Membrane Transport Apparatus 
Message Transport Agent 
Military Technical Agreement 
Month Treasury Average 
Magnetic Torque Assembly 
Magnetic Torquer Assembly 
Major Test Article 
Market Technicians Association 
Marshall Trowelable Ablator 
Mass Thermal Analysis 
Medical Technical Assistant 
Medical Technology Assessment 
Message Traffic Analysis 
Microwave Transition Analyzer 
military training agreement 
Monthly Treasury Average