| Acronym | Meaning |
| ACC-IOS | Azimutal Close Coupled-infinite Order Sudden |
| KBDS | Knowledge-based Design System |
| CAA | Computer Aided Analysis |
| PMP2 | (spin) Projected Moeller-Plesset Second-order (perturbation Theory) |
| VAZC | Vibrationally Adiabatic Zero Curvature (quantum Calcn. Approxn.) |
| XSAD | X-ray Small Angle Diffraction |
| PKI | Public Key Infrastructure |
| GERD | Gastroesophageal Reflux Disease |
| NSTA | National Science Teachers Association |
| CFB | Continental Flood Basalt |