| Meaning | Category |
| A Medical Data Drill | Medical |
| Maintenance Deferred Defect | Governmental->Military |
| Major Depressive Disorder | Medical->Physiology |
| Making Digits Dance | Business->Firms |
| Mal De Debarquement Syndrome | Medical->Physiology |
| Mate/Demate Device | Governmental->NASA |
| McDonnell Douglas | Business->Firms |
| Meaning Definition Document | Computing->General |
| Medical Device Directive | Medical->Hospitals |
| Medical Devices Directive | Governmental->US Government |
| Membership Development Director | Community->Non-Profit Organizations |
| Meteorological Data Distribution | Academic & Science->Ocean Science |
| Millennium Dawn Designs | Business->Firms |
| Millennium Dynamic Deformer | Miscellaneous->Science Fiction |
| Mineral Deposits Division | Governmental->US Government |
| Mirror Drive Doors | Computing->Hardware |
| Mirrored Disk Drive | Computing->Hardware |
| Mirrored Drive Door | Computing->Hardware |
| Montana Dangerous Drug | Community->Law |
| Multi Domed Daemon | Computing->Software |
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