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;
flood control in the Missouri basin
5.a bathroom or lavatory sink that is permanently installed and connected to a water supply and drainpipe; where you wash your hands and face;
he ran some water in the basin and splashed it on his face