| APM | Antena Pointing Mechanism |
| ADR | Ball bearing company |
| AOCS | Attitude and Orbit Control System (not altitude) |
| BB | Breadboard |
| BoL | Begining of life |
| CBSM | Craig-Bampton Stochastic Method |
| CCM | Corner Cube Mechanism |
| CDR | Critical Design Review |
| CFRP | Carbon Fiber Reinforced Polymer |
| CIDL | Configuration Item Data List |
| CMG | Control Moment(um) Gyroscope |
| CNES | Centre National d’Etudes Spatiales |
| CSD | Cross Sprectral Density |
| CTE | Coefficient of Thermal Expansion |
| CVCM | Collected Volatile Condensible Material |
| DCL | Declared Component List |
| DLF | Dynamic Load Factor (acoustics/vibrations) |
| DM | Development Model |
| DML | Declared Material List |
| DoF | Degree of Freedom (mechanics) |
| DPA | Destructive Part Analysis |
| DPL | Declared Process List |
| ECSS | European Cooperation for Space Standardization |
| EDAX | Energy Dispersive X-ray Analysis |
| EDM | Electric Discharge Machining |
| EEE | Electronic, Electric, and Electromechanic |
| EFEA | Energy Finite Element Analysis |
| EM | Engineering Model (electronic/electric/electromechanical) |
| EMC | Electromagnetic Compability |
| EoL | End of life |
| ESA | European Space Agency |
| ESTEC | European Space Research and Technology Centre |
| ESTL | European Space Tribology Laboratory |
| FEA | Finite Element Analysis |
| FEM | Finite Element Method/Model |
| FFT | Fast Fourier Transform (algorithm) |
| FM | Flight Model |
| FMCS | Fast Monte Carlo Simulation |
| FMECA | Failure mode, effects and criticality analysis |
| FRF | Frequency Response Function |
| FS | Flight Spare (Model) |
| FSM | Flight Spare Model |
| FSM | Flight Spare Model |
| FTIR | Fourier transform infrared spectroscopy (for oil condition) |
| GC-MS | Gas chromatography–mass spectrometry |
| GSE | Ground Segment Equipement |
| HDRM | Hold Down & Release Mechanism |
| HRM | Hold-down & Release Mechanism |
| I/F | Interface |
| JAXA | Japan Aerospace Exploration Agency |
| LAM | Laboratoire d’astrophysique de Marseille |
| LAT | Lot Acceptance Test |
| LEO | Low Earth Orbit |
| LOS | Line of Sight (optics) |
| MAC | Lubricant |
| MCS | Monte Carlo Simulation |
| MGSE | Mechanical Ground Segment Equipements |
| MLA | Multi Layer Actuator (Multilayer Piezo Ceramics) |
| MLI | Multi Layer Insulation |
| MoM | Method of Moments |
| MoS2 | Molybdenum Disulfide |
| MTF | Modulation Transfer Function |
| NASA | National Aeronautics and Space Administration |
| NPL | National Physical Laboratory (UK) |
| OP | Optical Path (optics) |
| PDR | Preliminary Design Review |
| PEEK | Polyether ether ketone |
| PEO | Plasma Electrolytic Oxidation |
| PFM | Protofight Model |
| PFPE | Lubricant like Fomblin Z25 |
| PSD | Power Spectrum Density |
| PTFE | Teflon |
| QM | Qualification Model |
| RCF | Reaction Wheel Characterization Facility (ESA) |
| RML | Recovered Mass Loss |
| RMS | Root Main Square |
| RSS | Root Sum Squared |
| RW | Reaction Wheel |
| RWA | Reaction Wheel Assembly |
| S/C | Spacecraft |
| SADM | Solar Array Drive Mechanism |
| SEA | Statistical Energy Analysis |
| SEM | Scanning Electron Microscope |
| SiC | Silicon Carbide |
| SLPMC | Self Lubricating Polymer Matrix Composites |
| SMA | Shape Memory Alloy |
| SMG | Stepper Motor Gearbox |
| SNR | Signal to Noise Ratio |
| SSTL | Surrey Satellite Technology |
| STM | Structural Thermal Model |
| TF | Transfer Function |
| TiC | Titanium Carbide |
| TiN | Titanium Nitride |
| TML | Total Mass Loss |
| TOFSIMS | Time-of-Flight Secondary Ion Mass Spectrometry |
| TRL | Technological Readiness Level |
| TRR | Test Readiness Review |
| VSCMG | Variable Speed Control Moment(um) Gyroscope |
| VSEA | Virtual Statistical Energy Analysis |
| XDM | X-ray Diffraction Microscope |
| XPS | X-ray photoelectron spectroscopy |