| Abbreviation | Definition |
|---|---|
| MAC | Magnitude Amplification Cavity |
| MACH | Modelo Acoplado de Coordinacion Hidrotermica |
| MAF | Mass Air Filter |
| MAFF | Munich Accelerator For Fission Fragments |
| MAG | Magnetic |
| MALDI | Matrix-Assisted laser Desorption Ionization |
| MAP | Maximum A Posteriori |
| MAPC | Maritime Applied Physics Corporation |
| MAPLE | Multipurpose Applied Physics Lattice Experiment |
| MAPS | Math Architecture Physics and Science |
| MAT | Manifold Air Temperature |
| MB | Muon Barrel |
| MBB | Medical Biochemistry and Biophysics |
| MBB | Molecular Biophysics and Biochemistry |
| MBH | Thousand BTU per Hour |
| MBq | MegaBecquerel |
| MBS | Many Body Systems |
| MBS | Minimum Breaking Strength |
| MBT | Many Branched Tree |
| MC | Magnetic Coil |