| Meaning | Category |
| Materiel Test Directorate | Governmental->Military |
| Maximum Tolerated Dose | Medical->Physiology |
| Maximum Tolerated Dose - phase 1 studies | Medical->Oncology |
| Measured Total Depth | Academic & Science->Geology |
| Memory Technology Devices | Business->Firms |
| Memory Test Driver | Computing->Software |
| Mettler- Toledo International, Inc. | Business->NYSE Symbols |
| Michael Tobias Design | Business->Firms |
| Mobility Technology Demonstration | Governmental->Military |
| Month To Date | Business->Accounting |
| Motor Transport Division (Old) | Governmental->Police |
| Mounted | Governmental->NASA |
| Mt. Sandford, Northern Territory, Australia | Regional->Airport Codes |
| Mycobacterium Tuberculosis Direct | Medical->Physiology |
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