| Acronym | Meaning |
 | APET | Accident Progression Event Tree |
| ARCSS | Arctic Systems Science |
| ABL | Atmospheric Boundary Layer |
| AAA | American Arbitration Association |
| IAGW | International Acoustic Gravity Waves |
| APT | Alliance For Photonic Technology |
| GED | Global Ecosystem Dynamics |
| FTE | Full-time Equivalent |
| IPS | Inches Per Second |
| SH | Southern Hemisphere |
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