| Acronym | Meaning |
| FLCAO | Factorized LCAO |
| ALSC | Adirondack Lakes Survey Corporation |
| MAER | Maximum Allowable Emission Rate |
| HREE | Heavy Rare Earth Element(s) |
| FFIS | Federal Facilities Information System |
| NDDO | Neglect Of Diatomic Differential Overlap |
| IBARE | Ion Beam Assisted Radical Etching |
| BLC | B Lymphocyte Chemoattractant |
| NWWA | Northwest Water Authority (UK) |
| CISC | Configuration Interaction (with) Size-consistency (correction) |