| Abbreviation | Definition |
|---|---|
| MR | Mission Report |
| MR | Mixture Ratio |
| MRA | Main Ring Assembly |
| MRA | Mechanical Readiness Assessment |
| MRC | Material Review Crib |
| MRC | Measurement Requirements Committee |
| MRC | Mid Roll Change |
| MRCR | Measurement Requirement Change Request |
| MRD | Material Review Disposition |
| MRD | Mission Requirements Document |
| MRDR | Material Review Disposition Record |
| MRF | Maintenance Responsibility File |
| MRF | Maximum Retarding Force |
| MRF | Measurements/stimuli Request Form |
| MRF | Mission Review Function |
| MRI | Measurement Requirements and Interface |
| MRI | Moderate Resolution Imager |
| MRIC | Missions Review and Initiatives Committee |
| MRIR | Medium Resolution Infrared Radiometer |
| MRL | Manipulator Retention Latch |