What does BASIN mean?

noun

1. a bowl-shaped vessel; usually used for holding food or liquids“she mixed the dough in a large basin”
2. the quantity that a basin will hold“a basinful of water”
3. a natural depression in the surface of the land often with a lake at the bottom of it“the basin of the Great Salt Lake”
4. the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet“flood control in the Missouri basin”
5. a bathroom sink that is permanently installed and connected to a water supply and drainpipe; where you can wash your hands and face“he ran some water in the basin and splashed it on his face”