| Acronym | Meaning |
 | CIEEL | Chem. Initiated Electron Exchange Luminescence |
| CRS | Controlled Release Society |
| HMA | Hot Mix Asphalt |
| EU | Enzyme Unit |
| RIMS | Resonance Ionization Mass Spectrometry |
| IIRF | Infinite Impulse Response Filter |
| IMPROVE | Interagency Monitoring For Protected Visual Environments |
| IBS | Irritable Bowel Syndrome |
| IWEM | Institution Of Water And Environmental Management |
| IUPAP | International Union Of Pure And Applied Physics |
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