| Acronym | Meaning |
| FWE | Faddeev-Watson Expansion (for T-operator In Atomic Collisions) |
| AAFEB | Anaerobic Attached Film Expanded Bed |
| BEWS | Biological Early Warning Systems |
| SSFP | Steady-state Free-precession |
| NES | Neurobehavioral Evaluation System |
| TAC | Toxic Air Contaminant |
| E-CATS | Electronic Catalog System |
| EOR | Enhanced Oil Recovery |
| MR-ACPF | Multireference-averaged Coupled Pair Functional |
| SEMPI | Singly Excited Modified Perturbation Theory |