The act of shutting up.

关闭。

That which encloses.

围墙；关闭物。

A parliamentary proceeding by which a debate may be stopped, usually by the vote of the majority.

(常用单数)(议会中)辩论终结。

The property that a number system or a set has when it is mathematically closed under an operation.

【数】封闭。

A set that contains a set and all limit points of the set.

【数】闭包。