| Acronym | Meaning |
| GSD | Geometric Std. Deviation |
| D.I. | Direct Injection [of Diesel Engines] |
| SAC-CI | Symmetry-adapted Cluster Configuration Interaction (theory For Wave-function Expansion) |
| RCRA | Resource Conservation And Recovery Act Of 1976 |
| FRAM | Ferroelectric Random Access Memory |
| RFGE | Rotating-field Gel Electrophoresis |
| MET | Many Electron Theory (for Singlet Ground State) |
| BK | Brinkman-Kramers (approxn. In Ion-mol. Collision Quantum Calcn.) |
| HRXRD | High Resolution X-ray Diffraction |
| IRS | Internal Recognition Subsequence |