| Acronym | Meaning |
| ROM | Reactive Oxygen Metabolite |
| SCSRC | Solids Contact Slurry Recirculating Clarifier(s) |
| PT2D | Second-order Perturbation Theory (with) Diagonal (part Of Fock Matrix) |
| PMAD | Power Management And Distribution (system) (of Space Station) |
| EAP | Emission Assessment Program |
| PTM | Perturbation Trajectory Method (in Gas-surface Collision Dynamics) |
| PSD | Particle Size Distribution |
| AIF | Apoptosis-inducing Factor |
| AOGCM | Atmosphere-ocean General Circulation Model |
| MVC | Mechanical Vapor Compression |