n.

1. 分开；分离[U][C]
   Lengthy separation of the boy from his mother could lead to psychological problems.

   这男孩长期与母亲分开会导致心理上的问题。

2. （邮件等的）分拣[U]
3. 分隔线，分隔点；间隔；分隔物[C]
4. 【律】（夫妇）分居[U][C]

n.

1. the action or state of separating or being separated.
   ▸the state in which a husband and wife remain married but live apart:

   a trial separation.
2. distinction between the signals carried by the two channels of a stereophonic system.
3. Physics  & Aeronautics  the generation of a turbulent boundary layer between a surface and a moving fluid.