noun

1. a round, wide, shallow container, as for holding water to wash in
2. its contents or capacity
3. a washbowl or sink
4. any shallow, rounded hollow or depression, often containing water, as a pond
5. a bay or harbor yacht basin
6. all the land drained by a river and its branches
7. a great hollow in the earth's surface filled by an ocean
8. Geol. a wide, depressed area in which the rock layers all incline toward a central area

Etymology: ME & OFr bacin < VL *baccinum < *bacca, water vessel