| Acronym | Meaning |
| MR-CI-PS | Multireference-CI-perturbatively Selected |
| FRC | Free Residual Chlorine |
| CFCMC | Continuous Fiber Ceramic Matrix Composites |
| IMPROVE | Interagency Monitoring For Protected Visual Environments |
| SRXPS | Spin-resolved X-ray Photoelectron Spectroscopy |
| SOMO | Semioccupied Molecular Orbital |
| OPIA | Optical Precision Instrument Associates |
| PIA | Peaking Impulse Approxn. (for Electron-exchange Collisions) |
| PIAD | Plasma-ion Assisted Deposition |
| WOCE | World Ocean Circulation Experiment |