| Acronym | Meaning |
 | MAP | Middle Atmosphere Program |
| MAPCON | A Routine Developed By Unidata For Contouring NPS Gridded Data On A Background Map From NetCDF Files |
| MAPR | Multi-angle Profiling Radar |
| MAPS | Measurement Of Air Pollution From Satellites |
| MAPS | Multiple Aircraft Positioning System |
| MAPS | Mesoscale Analysis And Prediction System |
| MAPS | Millions Of Actions Per Second |
| MAPS/RUC | MAPS Is The Research Version Of The Rapid Update Cycle |
| MAR | Modernization And Associated Restructing |
| MAR | Marshall Field Site |
| MARC | Middle Atmosphere Responses To Changes |
| MARC | Machine Readable Cataloging |
| MARD | Modernization Associated Restructuring Demonstration |
| MARI | Middle Atmosphere Research Initiative |
| MARK-IVB | N/A |
| MARS | Meteorological Airborne Radar Data System |
| MAS | Millimeter-wave Atmospheric Sounder |
| MASDIS | Meteorological Assimilation Data Ingest System |
| MASER | Microwave Amplification By Stimulated Emission Of Radiation |
| MASI | Middle Atmosphere Science Initiative |
| MASNET | Mainframe And Server Network |
| MASP | Multi-angle Aerosol Spectrometer Probe |
| MASSCOMP | Massachusetts Computer Corporation |
| MATCH | Model For Atmospheric Chemistry And Transport |
| MATCH | McGill University; Technical Improvements To The Large-scale Spectral Element Ocean Model (SEOM) |
| MATEX | Massive Air Tracer Experiment |
| MATR | MOPITT Algorithm Test Radiometer |
| MAYPOLE | May Polarization Experiment |
| MB | Millibar |
| MB | Megabits |
| MB | Megabytes |
| MB | Millibar |
| MBA | MB Associates |
| MBO | Management By Objective |
| MBONE | Multicast BackBONE |
| MBPS | Megabits |
| MBT | Miscellaneous Budget Transactions |
| MBY | Megabyte |
| MBYTE | Megabyte |
| MCA | Moist Convective Adjustment |
| MCA | Moist Convective Adjustment |
| MCA | Micro Channel Architecture |
| MCA | Manufacturing Chemists Association |
| MCBE | McIDAS Broadcast Evaluation |
| MCC | Mesoscale Convective Complex |
| MCC | Mission Control Center |
| MCCS | Mesoscale Convective Complexes |
| MCIDAS | Man-computer Interactive Data Access System |
| MCR | Multichannel Cloud Radiometer |
| MCS | Mesoscale Convective System |
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