What is the meaning of basin?

noun

• A bowl-shaped vessel; usually used for holding food or liquids.
  • usage: "she mixed the dough in a large basin"
• The quantity that a basin will hold.
  • usage: "a basinful of water"
  • synonyms: basinful
• A natural depression in the surface of the land often with a lake at the bottom of it.
  • usage: "the basin of the Great Salt Lake"
• The entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet.
  • usage: "flood control in the Missouri basin"
  • synonyms: river basin, watershed, drainage basin, catchment area, catchment basin, drainage area
• A bathroom sink that is permanently installed and connected to a water supply and drainpipe; where you can wash your hands and face.
  • usage: "he ran some water in the basin and splashed it on his face"
  • synonyms: washbasin, washbowl, washstand, lavatory