Noun

(en noun)

A bowl for washing, often affixed to a wall.

(geography) An area of land from which water drains into a specific river.

*{{quote-magazine, date=2012-01

, author=Douglas Larson , title=Runaway Devils Lake , volume=100, issue=1, page=46 , magazine= citation , passage=Devils Lake is where I began my career as a limnologist in 1964, studying the lake’s neotenic salamanders and chironomids, or midge flies. […] The Devils Lake Basin' is an endorheic, or closed, ' basin covering about 9,800 square kilometers in northeastern North Dakota.}}

(geography) A rock formation scooped out by water erosion.

Noun

(en-noun)

A starting point, base or foundation for an argument or hypothesis.

An underlying condition or circumstance.

* 2013 , Daniel Taylor, Danny Welbeck leads England's rout of Moldova but hit by Ukraine ban'' (in ''The Guardian , 6 September 2013)[http://www.theguardian.com/football/2013/sep/06/england-moldova-world-cup-qualifier-matchreport]

Hodgson may now have to bring in James Milner on the left and, on that basis , a certain amount of gloss was taken off a night on which Welbeck scored twice but barely celebrated either before leaving the pitch angrily complaining to the Slovakian referee.

regular frequency

You should brush your teeth on a daily basis at minimum.

The flights to Fiji leave on a weekly basis .

Cars must be checked on a yearly basis .

(linear algebra) In a vector space, a linearly independent set of vectors spanning the whole vector space.

(accounting) Amount paid for an investment, including commissions and other expenses.

(topology) A collection of subsets ("basis elements") of a set, such that this collection covers the set, and for any two basis elements which both contain an element of the set, there is a third basis element contained in the intersection of the first two, which also contains that element.