| Abbreviation | Definition |
|---|---|
| MD | Manual Direct |
| MD | Manual Disconnect |
| MD | Master Dimension |
| MD | Mission Director |
| MDA | Main Distribution Assembly |
| MDA | Maintainability Design Approach |
| MDA | MidDeck Assembly |
| MDA | Motor Drive Amplifier |
| MDA | Multiple Docking Adapter |
| MDAC | McDonnell Douglas Aerospace Corporation |
| MDAO | Multidisciplinary Design, Analysis, and Optimization Branch |
| MDAR | Malfunction Detection, Analysis, and Recording |
| MDAS | Meteorological Data Acquisition System |
| MDAS | Mission Data Acquisition System |
| MDB | Mission Data Book |
| MDC | Main Display Console |
| MDC | Mission Director Center |
| MDC | Mission Duty Cycle |
| MDCA | Main Distribution Control Assembly |
| MDCS | Maintenance Data Collection System |