| Acronym | Meaning |
 | GANC | Generalized Acid Neutralization Capacity Test |
| GAO | General Accounting Office |
| GAPT | Generalized Atomic Polar Tensor |
| GAR | Grain Aspect Ratio |
| GARP | Global Atmosphere Resesarch Project |
| GASH | Guanidine Aluminum Sulfate Hexahydrate |
| GASP | Gamma Astronomy At The South Pole |
| GASPE | Gated Spin-echo |
| GATE | GARP Atlantic Tropical Experiment |
| GAW | Global Atmospheric Watch |
| GAXRD | Glancing Angle X-ray Diffraction |
| GBA | Generalized Born Approxn. |
| GBCD | Grain Boundary Character Distribution |
| GBERL | Gulf Breeze Environmental Research Laboratory |
| GBF | Gibbs-Bogolyubov-Feynman (variational Principle) |
| GBH | Gravel Bed Hydroponic System (for Wastewater Treatment) |
| GBIF | Global Biodiversity Information Facility |
| GBM | Glioblastoma Multiforme |
| GBM | Glomerular Basement Membrane |
| GBS | Guillain-Barre Syndrome |
| GBS | Generalized Bohr-Sommerfeld (quantization Method) |
| GBS | Grain Boundary Sliding |
| GBS | Group B Streptococci |
| GBT | Generalized Brillouin Theorem |
| GC | Gas Chromatography |
| GC | Guanine + Cytosine |
| GC-MS | Gas Chromatography-mass Spectrometry |
| GC/MS/DS | Gas Chromatography/mass Spectrometry/data System (Finnigan) |
| GCA | Generator Coordinate Approxn. |
| GCAM | Global Change Assessment Modeling |
| GCB | Graphitized Carbon Black |
| GCC | Global Climate Coalition |
| GCCP | Global Climate Change Program |
| GCDIS | Global Change Data And Information System |
| GCE | Ground-based Cloud Experiment |
| GCE | Glassy Carbon Electrode |
| GCEC | Global Change And Ecological Complexity |
| GCECD | Gas Chromatography Electron Capture Detector |
| GCEMC | Grand Canonical Ensemble Monte Carlo |
| GCFR | Gas-cooled Fast Reactor |
| GCG | Genetics Computer Group |
| GCHAZ | Grain-coarsened Heat-affected Zone |
| GCHF | Generator Coordinate Hartree-Fock |
| GCIB | Gas Cluster Ion Beam |
| GCL | Geosynthetic Clay Liner |
| GCLDA | Gradient-corrected Local Density Approximation |
| GCLSDA | Gradient-corrected Local Spin Density Approximation |
| GCM | General Circulation Model |
| GCM | Generator-coordinate Method |
| GCM | Global Climate Model |
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