| Acronym | Meaning |
| MOPA | Master Oscillator Power Amplifier |
| EKMA | Empirical Kinetic Modeling Approach (in Air Pollution) |
| QPO | Quasi-periodic Oscillation |
| DGNAA | Delayed Gamma-ray Neutron Activation Analysis |
| RGA | Residual Gas Analysis |
| START | Strategic Arms Reduction Treaty |
| MOMO | Maximum Overlap Molecular Orbital |
| OLGA | On-Line Gas Chemistry Apparatus |
| BIR | Baculovirus IAP Repeat |
| SSRI | Selective Serotonin Reuptake Inhibitor |