All | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
| Acronym | Meaning | Source |
| M | Mach number (followed by figures ie .02 = Mach .02) | AIS |
| M (m) | Metres (preceded by figures) | AIS |
| M/E | Multi-engine | |
| MAAT | Manual Authoring and Assessment Tool | |
| MAE | Men and Equipment | AIS |
| MAG | Magnetic | AIS |
| MAHWP | Missed Approach Holding Way-point | AIS |
| MAINT | Maintenance | AIS |
| MAN | Manual | AIS |
| MAP | Aeronautical Maps and Charts | AIS |
| MAP | Manifold Air Pressure | |
| MAPT | Missed Approach Point | ICAO/AIP |
| MAR | At Sea | AIS |
| MAR | March | AIS |
| MAUW | Maximum All Up Weight | |
| MAWP | Missed Approach Waypoint | AIS |
| MAX | Maximum | AIS |
| MBST | Microburst | AIS |
| MBZ | Mandatory Broadcast Zone | AIP |
| MCANTO | CASA's Manufacturing, Certification and New Technologies Office (Now Airworthiness Engineering Branch) | CASA |
| MCC | Multi-crew Co-ordination | |
| MCM | Maintenance control manual | CASR Part 145 |
| MCQFS | Manual of criteria for the qualification of flight simulators ICAO Doc 9625-AN/938 | CASR Part 60 |
| MCUR | Mean Cycles Between Unscheduled Removals | WATOG |
| MCW | Modulated Continuous Wave | AIS |
| MDA | Minimum Descent Altitude | AIS |
| MDF | Medium Frequency Direction Finding Station | AIS |
| MDR | Major Defect Report | CAR 1988 |
| MEA | Minimum En-route Altitude | AIS |
| MED | Medical | AIS |
| MEL | Minimum equipment list | ICAO |
| MEMS | Micro Electro-mechanical Systems | |
| MERSITAB | Manufacturing, Engineering and Related Services Industry Training Advisory Body | CASR Part 66 |
| MET | Meteorological, Meteorology | AIS |
| MET | REPORT Aviation routine weather report | AIS |
| METAR | Aviation routine weather report (in aeronautical meteorological code) | AIS |
| METRAD | MET Radar | AIS |
| MF | Medium Frequency (300 to 3000 KHZ) | AIS |
| MHZ (mhz) | Megahertz | AIS |
| MIFG | Shallow Fog | AIS |
| MIL | Military | AIS |
| MIL-STD | Military Standard | |
| MIN | Minutes | AIS |
| MIOL | Medium Intensity Obstacle Lights | AIS |
| MIRL | Medium Intensity Runway Lights | AIS |
| MISC | Miscellaneous | AIS |
| MKR | Marker Radio Beacon | AIS |
| MLJ | Military Low Jet | AIS |
| MLJR | Military Low Jet Route | AIS |
| MLS | Microwave Landing System | AIS |
| MLW | Maximum Landing Weight | AIS |
| MM | Middle Marker | AIS |
| MMEL | Master minimum equipment list | ICAO |
| MNM | Minimum | AIS |
| MNT | Monitor, Monitoring, | AIS |
| MNTN | Maintain, Maintained, Maintaining | AIS |
| MOA | Military Operating Area | AIS |
| MOC | Minimum obstacle clearance (required) | ICAO/AIP |
| MOD | Moderate, Moderately | AIS |
| MOD | Moderate (used to indicate the intensity of WX phenomena, interference or static reports, eg MOD RA = moderate rain). | AIS |
| MON | Above Mountains | AIS |
| MON | Monday | AIS |
| MOPS | Minimum Operational Performance Standards | AIS |
| MOS | Manual of Standards | CAR 1998 |
| MOU | Memorandum of understanding | |
| MOV | Move, Moved, Moving, Movement | AIS |
| MOWP | Method of Working Plan | AIS |
| MPD | Maintenance Planning Data | ATA/FAR |
| MPI | Magnetic Particle Inspection | |
| MPL | Multi-crew Pilot Licence (MPL) | ICAO Annex 1 'Personnel Licensing' |
| MPS | Metres per Second | AIS |
| MPT | Magnetic Particle Inspection Technician | |
| MRB | Maintenance Review Board | ATA/FAR |
| MRBR | Maintenance Review Board Report | |
| MRG | Medium Range | AIS |
| MRO | Maintenance, repair and overhaul | CASR Part 145 |
| MRP | ATS/MET Reporting Point | AIS |
| MS | Minus | AIS |
| MSA | Minimum sector altitude | AIP |
| MSAS | Multi-function Transport Satellite (MTSAT) Satellite-based Augmentation System | |
| MSDS | Material Safety Data Sheets | |
| MSG | Message | AIS |
| MSG | Maintenance Steering Group | ATA/FAR |
| MSG-3 | Maintenance Steering Group Logic Process | |
| MSI | Maintenance Significant Item | WATOG |
| MSL | Mean Sea Level | AIS |
| MSOS | Maintenance specific operation specification | CASR Part 145 |
| MSSR | Monopulse Secondary Surveillance Radar | AIS |
| MT | Mountain | AIS |
| MTBF | Mean Time Between Failure | WATOG |
| MTBR | Mean Time Between Removals | WATOG |
| MTBUR | Mean Time Between Unscheduled Removals | WATOG |
| MTO | Maintenance training organisation | CASR Part 147 |
| MTOW | Maximum take-off weight | AIP |
| MTP | Maximum Tyre Pressure | AIS |
| MTSAT | Multi-function Transport Satellite | |
| MTTF | Mean Time To Failure | WATOG |
| MTTR | Mean Time To Repair | WATOG |
| MTTUR | Mean Time To Unscheduled Removal | WATOG |
| MTUR | Special Term For Data Transmittal | WATOG |
| MTW | Mountain waves | AIS |
| MVA | Minimum Vector Altitude | AIS |
| MWO | Meteorological Watch Office | AIS |
| MX | Mixed type of ice formation (white and clear) | AIS |