| Acronym | Meaning |
| PIGS | Pesticides In Groundwater Strategy |
| AOB | Ammonia Oxidizing Bacteria |
| MCPF | Modified Coupled-pair Functional (method In CI Calcns.) |
| AGB | Asymptotic Giant Branch (stars) |
| WERL | Water Engineering Research Laboratory |
| ELNES | Electron Energy-loss Near Edge Structure |
| FSMRCC | Fock Space Multireference Coupled Cluster |
| DPA | Differential Pulse Amperometry |
| CLD | Certainly Lethal Dose |
| SET | Single Electron Transfer |