Adjective

(-)

Sealed, made inaccessible or impassable; not open

(of a store or business) Not operating or conducting trade

Not public.

closed source

a closed committee

(topology, of a set) Having an open complement.

(mathematics, of a set) Such that its image under the specified operation is contained in it.

The set of integers is closed under addition: $\backslash forall\; x,y\backslash in\backslash mathbb\{Z\}\backslash ,x+y\backslash in\backslash mathbb\{Z\}$.

(mathematics, logic, of a formula) Lacking a free variable.

Adjective

(-)

(of a lake or basin) Internally drained; having no outlet.

* 1937 , Collected Papers - Osborn Zoological Society , Volume 19, Yale University, page 94,

On the other hand all closed lakes of the kind now being considered must lie in endorheic regions.

* 1998 , Brian Moss, Ecology of Fresh Waters: Man and Medium, Past to Future , Third Edition, Blackwell Publishing, ISBN 978-0-632-03512-0, page 198,

The catchment-derived water-supply, in evaporating, leaves salts and the basin becomes an endorheic (internally drained) salt lake.

* 2012 , Yeqiao Wang, ed., Remote Sensing of Protected Lands , CRC Press, ISBN 978-1-4398-4187-7, page 318,

Tibetan lakes in the endorheic basins are dynamic and sensitive to climate change.

*{{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.