| Acronym | Meaning |
 | MICROSOFT WINDOWS | N/A |
| MICROVAX | N/A |
| MIDI | Musical Instrument Digital Interface |
| MIDNET | N/A |
| MIESR | Matrix Isolation/Electron Spin Resonance |
| MIGS | MASnet Internet Gateway Server (or System) |
| MILNET | Military Network |
| MILOX | Mid-Latitutde Ecosystem And Photochemical Oxidants |
| MIMD | Multiple Instruction Multiple Data |
| MIMR | Multiband Imaging Microwave Radiometer |
| MIMSA | Minority Institutions In Marine Sciences Association |
| MIP | Millions Of Instructions Per Second |
| MIP | Millions Of Instructions Per Second |
| MIPS | Millions Of Instructions Per Second |
| MIRA | Management Information Research Associates |
| MIRAGE | Megacity Impacts On Regional And Global Environments |
| MIRAGE-MEXICO | Megacity Impact On Regional And Global Environments-Mexico Campaign |
| MISR | Multiangle Imaging Spectroradiometer |
| MIST | Microburst And Severe Thunderstorm Experiment |
| MIT | Massachusetts Institute Of Technology |
| MITI | Ministry Of International Trade And Industry |
| MIZEX | Marginal Ice Zone Experiment |
| MJO | Madden-Julian Oscillation |
| MKS | Meter-kilogram-second System Of Measurement |
| MKS | Unit Of Force Replaced By Newtons |
| MKSA | Absolute MKS |
| ML | Mesa Laboratory |
| MLI | Multiple Layer Insulation |
| MLM | Time-varying Horizontal Model Of The Lavoice Type |
| MLNAC | Mesa Lab Network Access Completion |
| MLO | Mauna Loa Observatory |
| MLOPEX | Mauna Loa Photochemistry Experiment |
| MLS | Microwave Limb Sounder |
| MLSO | Mauna Loa Solar Observatory |
| MLT | Magnetic Local Time |
| MM | Milli Mole |
| MM4 | Mesoscale Model |
| MM5 | Fifth-generation Mesoscale Model |
| MM90 | N/A |
| MMAC | Multi-Media Access Center |
| MMD | Mass Median Diameter |
| MMD | Mass Median Diameter |
| MMI | Monthly Management Information Report |
| MMI | Man-made Interface |
| MMM | Mesoscale And Microscale Meteorology |
| MMOL | Manned Orbital Laboratory |
| MMS | Minerals Management Service |
| MMS | Microscale Meteorology Section |
| MMSS | Multimission Support Service |
| MNP | Microcom Network Protocol |
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