| Acronym | Meaning |
| NWWA | Northwest Water Authority (UK) |
| BPEO | Best Practicable Environmental Option |
| PAR | Photosynthetically Active Radiation |
| HATR | Horizontal Attenuated Total Reflection |
| SIMBA | Selective Inverse Multiple Bond Analysis |
| QLSM | Quadratic Least-squares Method (variational For Scattering) |
| R2PI | Resonant Two-photon Ionization |
| INDO/CS | INDO/conformation Spectra |
| ALA | American Library Association |
| CIS | Chemical Information System |