| Acronym | Meaning |
 | GEN | Generate |
| GENOPAUSE | Geodetic Satellite In Polar Geosynchronous Orbit |
| GEOD | Geodetic |
| GEOSEPS | General Summary Edit Program |
| GEOSEPS | Geosynchronous Solar Electric Propulsion Stage |
| GEOSYNCHRON | Geosynchronous Operational Environmental Satellite |
| GERT | Graphical Evaluation And Review Technique |
| GES | Goddard Experiment SuPport System |
| GESYOT | GCOS Program Element Name |
| GET | Ground Elapsed Time |
| GETI | Ground Elapsed Time Of Ignition |
| GETIL | Abort Burn) |
| GETIL | Ground Elapsed Time Of Landing (for TIG Of |
| GETS | Ground Equipment Test Sets |
| GF | Gage Factor |
| GFAE | Government Furnished Aerospace Equipment |
| GFAE | Government Furnished Aircraft Equipment |
| GFD | Government Furnished Data |
| GFE | Government Furnished Equipment |
| GFM | Government Furnished Material |
| GFP | Government Furnished Property |
| GFRP | Glass Fiber Reinforced Plastics |
| GFRP | Graphite Fiber Reinforced Plastics |
| GFS | Government Furnished Software |
| GFY | Government Fiscal Year |
| GG | Gas Generator |
| GG | Gravity Gradient |
| GH2 | Gaseous Hydrogen |
| GH2 | Gaseous Hydrogen |
| GHA | General Housekeeping Area |
| GHA | Greenwich Hour Angle |
| GHC | Ground Half Coupling |
| GHE | Gaseous Helium |
| GHX | Ground Heat Exchanger |
| GHZ | Gigahertz |
| GIA | GPC Interface Adapter |
| GIDEP | Government-industry Data Exchange Program |
| GIE | Ground Instrumentation Equipment |
| GIM | Generalized Information Management |
| GIRD | Ground Integration Requirements Document |
| GITG | Ground Interface Technical Group |
| GLAADS | Gun Low Altitude Air Defense System |
| GLC | Generator Line Contractor |
| GLD | Glide Slope |
| GLL | Galileo |
| GLP | Goal Language Processor |
| GLRSHLD | Glare Shield |
| GLS | Ground Launch Sequence (Sequencer) |
| GLY | Glycol |
| GLY | Water-Glycol Mixture |
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