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"M" Terms and Definitions
| Mach number | Ratio of true airspeed to the speed of sound |
| MAP | Missed Approach Point |
| Marker Beacons (mkrs) | Part of an instrument landing system using 75 MHz transmitters emitting fan-shaped or elliptical signal patterns vertically upwards, defining specific points along the glideslope. Markers provide aural and visual indications on a cockpit marker beacon receiver |
| MATZ | Military Aerodrome Traffic Zone |
| Mayday | International radio distress call |
| Mb | Millibar |
| MDA | minimum descent altitude |
| MEDA | Military Emergency Diversion Airfield |
| Met | Meteorology, weather |
| METAR | Coded aerodrome Met report |
| MF | Medium Frequency. Radio waves with frequencies in the 300- 3,000 kHz range |
| MFA | Military Flying Area |
| MFD | Multi-Function Display - selectable displays of weather radar, navigation maps, checklists and data other than primary flight information |
| MH | Magnetic Heading |
| MHz | Megahertz, the frequency of radio carrier waves measured in millions of cycles per second |
| Minimums | Weather condition requirements for a particular mode of flight |
| MLS | Microwave Landing System |
| MMARS | Military Middle Airspace Radar Service, available to military and civil aircraft operating in UK airspace between FL100 and FL245 |
| MOA | Military Operations Area |
| Mogas | car fuel, approved for use in some light aircraft subject to certain conditions |
| MPA | Man-Powered Aircraft |
| MSA | Minimum Sector Altitude Or Minimum Safe Altitude |
| MSL | Mean Sea Level |
| MTBF | Mean Time Between Failures. Also MTTR, mean time to repair |
| MTMA | Military Terminal Control Area |