| Acronym | Meaning |
| PSID | Pounds Per Square Inch Differential |
| MPC | Mother-of-pearl Clouds |
| IPEI | Ionospheric Plasma And Electrodynamics Instrument |
| MASDIS | Meteorological Assimilation Data Ingest System |
| HEAO | High Energy Astronomy Observatory |
| SRES | Special Report On Emissions Scenarios |
| ERTD | Environmental Research & Technology Division |
| ALS | Advanced Launch System |
| VCO | Voltage-controlled Oscillation |
| EMR | Electronic Mail Registration |