| Meaning | Category |
| Bibliographic data (Machine-Readable Cataloging records) | Computing->File Extensions |
| Maganti Ravindranath Chowdary | Academic & Science->Mathematics |
| Magic Rave Crew | Community->Music |
| Major Regional Conflict | Governmental->Military Governmental->US Government |
| Map Reference Code | Governmental->Military |
| Marine Research Corporation | Business->Firms Academic & Science->Ocean Science |
| Material Review Crib | Governmental->NASA |
| Materiel Release Confirmation | Governmental->Military |
| Mathematics Research Center | Academic & Science->Universities |
| Maximum Reservoir Contact | Academic & Science->Geology |
| Measurement Requirements Committee | Governmental->NASA |
| Meat Research Corporation ( Australia) | Medical->Veterinary |
| Media Resource Center | Community->Media |
| Media Resource Centre | Academic & Science->Libraries |
| Medical Research Charities | Community->Non-Profit Organizations |
| Medical Research Council | Medical->Human Genome Medical->Laboratory Medical->Oncology Business->Professional Organizations |
| Medican Research Council | Medical |
| Membership Renewal Credit | Community->Non-Profit Organizations |
| Mid Roll Change | Governmental->NASA |
| Militarized Reconfigurable Computer | Computing->Hardware Governmental->Military |
| Milwaukee Repeater Club | Academic & Science->Amateur Radio Miscellaneous->Hobbies |
| Minimal Remanent Change | Academic & Science->Physics |
| Minimum Of Rows And Columns | Computing->General |
| Minority Resource Center | Community |
| Mississippi River Commission | Governmental->US Government |
| Model Rectifier Corp | Business->Firms |
| Model Rectifier Corporation | Business->Firms |
| Modern Rate Of Change | Business->General |
| Monoid Ring Completion | Academic & Science->Chemistry |
| Monthly Recurring Charge | Business->Accounting |
| Monthly Recurring Charges | Computing->Telecom |
| Mount Royal College | Academic & Science->Universities |
| Muddy Rain Conditions | Academic & Science->Meteorology |
| Multi Resistant Coating | Academic & Science->Chemistry |
| Multi Resolution Curves | Academic & Science->Mathematics |
| Municipal Regional County | Governmental->State & Local |
| Mutant Research Centre | Medical->Laboratory |
| mail recovery center | Miscellaneous->USPS |
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