n.

1. 再聯合；再會合[U][S1]
   He was instrumental in the reunion of the two parties.

   他對兩黨再次聯合起到了促進作用。

2. （親友等的）團聚，重聚；重聚聯歡會[C]
   Our family has a yearly reunion.

   我們每年合家團聚一次。

n.

1. the process or an instance of reuniting.
2. a social gathering attended by members of a group of people who have not seen each other for some time.