(mathematics, physics) Informally, a set of points from which a dynamical system spontaneously moves to a particular attractor.

plural of drainage basin

(dated) A container used for urinating or defecating when it is impossible or inconvenient to go to a bathroom or toilet; a bedpan, a chamber pot. Commonly used in hospitals, where it is normally called bedpan. Formerly used in private residences, particularly those without an indoor toilet or bathroom.

A large arid area of the western United States of America.

plural of river basin

(geography) An extent of land where water from rain or snow melt drains downhill into a river or series of rivers.

A depression in the ground designed to fill with rainwater that would otherwise cause flooding

plural of catchment basin

A cistern or vault at the point where a street gutter discharges into a sewer, to catch bulky matter that would not pass readily through the sewer.

plural of catch-basin