| Acronym | Meaning |
| GQDPT | Generalized Quasidegenerate Perturbation Theory |
| ZIA | Zone Immunoassay |
| LEOS | Lasers And Electro-Optics Society |
| NTU | Number Of Transfer Units (in Packed Tower Aeration System) |
| ALCA | American Leather Chemists' Association |
| ACP | Air Carcinogen Policy |
| PACS | Physics And Astronomy Classification Scheme |
| CVL | Copper Vapor Laser |
| RTCDW | Relativistic Target Continuum Distorted Wave (approxn. For Electron Capture In Ion-atom Collisions) |
| RMCSTEP | Repartitioned Multiconfigurational Spin-tensor Electron Propagator |