| Meaning | Category |
| Kansas City Southern Railway Company | Regional->Railroads |
| Maiden Dirt Route | Community->Sports |
| Maintenance Demand Rate | Governmental->NASA |
| Major Design Review | Governmental->NASA |
| Manifestation Determination Review | Medical->Physiology |
| Manorial Document Register | Business->General |
| Marketing that Delivers Results | Business->General |
| Mass Data Reporting | Computing->Databases |
| Mass Distribution Ratio | Academic & Science->Physics |
| Maximum Detectable Rigidity | Academic & Science->Physics |
| McDermott International, Inc. | Business->NYSE Symbols |
| Medical Doctors Research | Academic & Science->Universities |
| Memories, Dreams, Reflections | Community |
| Memory Disc Register | Computing->Hardware |
| Menage Du Ra | International->French |
| Meta Data Repository | Computing->Databases |
| Microdrive file (ZX Spectrum emulator) | Computing->File Extensions |
| Midas Data Recorder | Computing->Hardware |
| Milestone Decision Review | Governmental->Military |
| Minimum Daily Requirement | Miscellaneous->Food |
| Minimum Decompression Rules | Academic & Science->Ocean Science |
| Minor Discrepancy Repair | Governmental->NASA |
| Missing Data Report | Governmental->NASA |
| Mission Data Reduction | Governmental->NASA |
| Mojave Desert Racing, Inc. | Business->Firms Community->Sports |
| Monthly Director's Review | Governmental->NASA |
| Mort De Rire | International->French |
| Most Dangerous Receiver | Community->Sports |
| Multi Drug Resistance | Medical->Laboratory |
| Multi Drug Resistant | Medical->Oncology |
| Multifactor Dimensionality Reduction | Computing->Software |
| Multiple Disease Resistance | Medical->Physiology |
| Multiple Drug Resistant | Medical->Hospitals |
| Multiservices Dynamic Reservation | Computing->Networking |
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