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1heavy material, such as gravel, sand, iron, or lead, placed low in a vessel to improve its stability. heavy material carried in an airship or on a hot-air balloon to stabilize it, and jettisoned when greater altitude is required. something that gives stability or substance:the film is an entertaining comedy with some serious ideas thrown in for ballast 2gravel or coarse stone used to form the bed of a railroad track or road. a mixture of coarse and fine aggregate for making concrete. 3a passive component used in an electric circuit to moderate changes in current.
verb [with object] (usually be ballasted)
1give stability to (a ship) by putting a heavy substance in its bilge:the vessel has been ballasted to give the necessary floating stability 2form (the bed of a railroad line or road) with gravel or coarse stone.