| Abbreviation | Definition |
|---|---|
| MARSERVER | MAC Address Resolution server |
| MARVIN | Movement Aware Routing oVer Interplanetary Networks |
| MAS | Modem Aggregation Services |
| MAST | Monitoring And Support Time |
| MathML | Mathematics Markup Language |
| MAU | Medium Access Unit |
| MBBS | Managed BroadBand Service |
| MBC | Moscow Boulder Cambridge |
| MBGP | Multicast Border Gateway Protocol |
| MBIT | Megabit |
| MBMS | Multi-media Broadcast Multicast Service |
| MBSIP | Multi-purpose Business Security over Internet Protocol |
| MC | Multi Computer |
| MCA | Message Channel Agent |
| MCC | Multiple Channel Card |
| MCNS | Multimedia Cable Network System |
| MCP | Message Control Protocol |
| MCS | Media Convergence Server |
| MCS | Message Control System |
| MCSE | Microsoft Certified Systems Engineer |