| Acronym | Meaning |
| CIAP | Climate Impact Assessment Program |
| IRE | Internal Reflection Element |
| MOV | Metal-Oxide Varistor |
| DSID | Direct Sample Insertion Device |
| MLT | Magnetic Local Time |
| ATDC | After Top Dead Center (gasoline And Diesel Engine Timing) |
| IATA | International Air Transport Association (Geneva |
| CVM | Cluster Variation Method (in Calcns. On Semiconductors) |
| OEAO | Overlap Enhanced Atomic Orbital |
| ACD | Allergic Contact Dermatitis |