| Acronym | Meaning |
| ASTDR | Agency For Toxic Substances And Disease Registry |
| AMSA | Association Of Metropolitan Sewerage Agencies |
| BPNN | Back Propagation Neural Network |
| MGMS | Molecular Graphics And Modelling Society |
| CCD | Coupled-cluster Doubles |
| SF CC | Space-fixed Close-coupled (equation |
| AMS | Aerospace Material Specification |
| TDR | Time Domain Reflectometer |
| APT | Atomic Polar Tensor (in Ir Spectra Calcn.) |
| UCDW | Ultrarelativistic Continuum Distorted Wave |