| Acronym | Meaning |
| RAS | Returned Activated Sludge |
| MMTV | Mouse Mammary Tumor Virus |
| LMFBR | Liquid-Metal Fast Breeder Reactor |
| ROS | Restricted (or Roothaan) Open-shell (Hamiltonian) |
| SWSV | Square-wave Stripping Voltammetry |
| DLPCB | Dioxin-like Polychlorinated Biphenyl |
| EXRHF | Extended Restricted Hartree-Fock |
| CCRM | Coupled-channel Reactance Matrix (in Atom Surface Scattering) |
| OFPT | Operator Form (of) Perturbation Theory |
| MMLV | Moloney Murine Leukemia Virus |