| Acronym | Meaning |
| MCLG | Maximum Contaminant Level Goal |
| MMAD | Mass Median Aerodynamic Diameter (aerosol) |
| CCD | Coupled-cluster Doubles |
| NASA | National Aeronautics And Space Administration |
| MBAS | Methylene Blue Active Substance (surfactant) |
| ABMT | Autologous Bone Marrow Transplantation |
| ROA | Relaxed Orbital Approximation |
| SPDT | Single-pole Double-throw (switch) |
| NETAC | National Environmental Technol. Applications Corporation |
| APA | Alkaline Phosphatase Activity |