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| Sr. | Term | Definition |
| 1 | Gabions | Compartmented rectangular containers made of galvanized hexagonal steel wire mesh and filled with stone. Gabions are used to stabilize and protect embankment slopes from erosion. |
| 2 | Gantry | (1) A temporary staging for carrying heavy loads, such as earth. (2) overhead structure that supports signs, usually built of square timbers or steel joists. |
| 3 | Geosynthetics (Geomatrix, Geomembrane And Geotextile) | Thin fabrics membranes and composites placed between soil layers to prevent sliding and for reinforcing or to retard the migration of clay into the pavement structure or placed between pavement layers for reinforcing or to retard crack propagation from an underlying layer to the one above it. |
| 4 | Girder | A large beam, usually of steel or concrete. Its chords are parallel or nearly so, unlike a truss. |
| 5 | Gore | The V (Triangular) shaped area immediately beyond the divergence of two roadways bounded by the edges of those roadways. |
| 6 | Granular | Material that does not contain more than 35 percent of soil particles which will pass a No. 200 sieve. |
| 7 | Grading | Shaping and leveling the ground surface, usually by earth-moving equipments such as graders. |
| 8 | Gradient Or Grade | The rise or fall per unit horizontal length (Slope) of a pipe, road, railway, flume, etc. Slope also expressed as the number of degrees from the horizontal or as a percentage. |
| 9 | Gravel | Granular material retained on a No. 4 sieve (4.76 mm) which is the result of natural disintegration of rock, or untreated or only slightly washed, rounded, natural aggregate, larger than 5 mm. |
| 10 | Grid | Any rectangular layout of straight lines (Generally used in locating points on a plan). |
| 11 | Grillage | A footing or part of a footing consisting of horizontally laid timbers or steel beams. |
| 12 | Grooving | The process of producing grooves in a concrete pavement surface to improve frictional characteristics. |
| 13 | Groundwater | Water contained in the soil or rocks below the water table. Water table if lowered too much, the ground may settle disastrously. |
| 14 | Groundwater Lowering | Lowering the level of groundwater is to ensure a dry excavation in sand or gravel or to enable the sides of the excavation to stand up. Groundwater lowering in this sense is always carried out from outside the excavation either by well-points or from filter wells. |
| 15 | Grout | (1) To fill with grout. (2) Fluid or semi-fluid cement slurry or a slurry made with other materials for pouring into the joints of brickwork or masonry or for injection into the ground or prestressing ducts. Grouting of ducts improves the bond and may reduce corrosion of the tendons but it prevents their inspection and re-tensioning or renewal. |
| 16 | Gunite, Shoutcrete | A cement-sand mortar, thrown on to formwork or walls or rock by a compressed-air ejector, which forms a very dense, high-strength concrete. It is used for repairing concrete surfaces, making the circular walls of preload tanks, protecting wearing surfaces of coal bunkers; covering the walls of mine airways or water tunnels, stabilizing earth excavation slopes and so on. |
| 17 | Gulley | (1) A pit in the gutter by the side of a road. It is covered with a grating. (2) A small grating and inlet to a drain to receive rainwater and wastewater from sinks, baths or basins. |
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