| Meaning | Category |
| Maintenance Management Services | Governmental->US Government |
| Maintenance Management System | Governmental->Transportation |
| Manifest Mailing System | Miscellaneous->USPS |
| Manufacturing Message Specification | Computing->Networking |
| Manuscript Management System | Community->Media |
| Marshall Middle School | Community->Schools |
| Masala Messaging Service | Computing->Software |
| Master Of Management Studies | Academic & Science->Academic Degrees |
| Maximus, Inc. | Business->NYSE Symbols |
| McCord Middle School | Community->Schools |
| Meteorological Measuring Set | Governmental->Military |
| Microsoft Multimedia Server | Computing->Software |
| Mineral Management Service | Academic & Science->Meteorology |
| Minerals Management Service | Academic & Science->Ocean Science Governmental->US Government Governmental |
| Modular Mechatronic System | Computing->General |
| Molecular Modeling System | Medical->Human Genome |
| Monolithic Miniature Spectrometer | Academic & Science->Electronics |
| Morley's Magic Stick | Business->Firms Community->Music Internet->Chat |
| Motorola Messaging Server | Computing->Telecom |
| Multi Micro Sensor | Academic & Science->Electronics |
| Multi Monitor Series | Computing->General |
| Multimedia Message Service | Computing->Telecom |
| Multimedia Messaging Service | Computing->Telecom |
| Multimedia Messaging Services | Computing->Networking |
| Multimedia Messaging System | Computing->Telecom |
| Multimedia Messenger Service | Community->Media |
| Multiple Model System | Academic & Science->Mathematics |
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