Material used to fill a cavity or a passage. Fill is generally prefixed by a word describing its dominant grain size e.g., sand fill, silt fill, clay fill, gravel fill, etc. Material deposited or washed into a cave passageway. Manmade deposits of natural soils and waste material. Any sediment deposited by any agent so as to fill or partly fill a valley, sink, or other depression. The depth to which material is to be placed to bring the surface to a predetermined grade. Also, the place filled by such an enbankment. Soil or loose rock used to raise the surface of low-lying land, such as an embankment to fill a hollow or ravine in railroad construction. Manmade deposits of natural earth materials (e.g., rock, soil, and gravel) and waste materials (e.g., tailings or spoil from dredging), used (1) to fill an enclosed space, such as an old stope or chamber in a mine, (2) to extend shore land into a lake or bay, or (3) in building dams.
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