a circular container with a greater width than depth, becoming smaller toward the bottom, used chiefly to hold water or other liquid, esp. for washing.

any container of similar shape, as the pan of a balance.

the quantity held by such a container

We need another basin of water to dilute the mixture.

a natural or artificial hollow place containing water.

a partially enclosed, sheltered area along a shore, often partly man-made or dredged to a greater depth, where boats may be moored

a yacht basin.

Geology . an area in which the strata dip from the margins toward a common center.

Physical Geography .

a hollow or depression in the earth's surface, wholly or partly surrounded by higher land

river basin.

drainage basin.

Botany . the depression in an apple, pear, or other pome at the end opposite the stem.

noun

bay , bowl , concavity , depression , dip , ewer , gulf , hole , hollow , lagoon , pan , pool , pot , sag , sink , sinkage , sinkhole , tub , valley , vessel , watershed , pit , crater , dish , dock , font , lavatory , marina , receptor , reservoir , stoup , tank , washbowl