| Acronym | Meaning |
| THOUS | Thousarid |
| GEOSEPS | Geosynchronous Solar Electric Propulsion Stage |
| GAPL | Group Assembly Parts List |
| NAS | National Aircraft Standard |
| STA | Structural Test Article |
| OSSRH | Orbiter Subsystem(s) Requirements Handbook |
| TR | Time To Retrofire |
| PUGS | Propellant Utilization And Gaging System |
| EVLSS | Extravehicular Life Support System |
| PKM | Perigee KickMotor |