| Acronym | Meaning |
| LSW | Localized Spherical Wave (in Electronic Structure Calcns.) |
| NPAR | Nonbinding Preliminary Allocation Of Responsibility |
| OLR | Organic Loading Rate |
| EDSTAC | Endocrine Disruptor Screening And Testing Advisory Committee |
| SCSRC | Solids Contact Slurry Recirculating Clarifier(s) |
| PIAMS | Photoionization Aerosol Mass Spectrometry |
| MPRI | Multiphoton Resonance Ionization |
| UOT | Universal Oxidn. Test |
| PDCAAS | Protein Digestibility Correlated Amino Acid Score |
| EFTEM | Energy-filtering Transmission Electron Microscopy |