If people are reunited, or if they reunite, they meet each other again after they have been separated for some time.
例句
She and her youngest son were finally allowed to be reunited with their family...她和小儿子终于得到允许和家人团聚。She spent the post-war years of her marriage trying to reunite father and son...在战后几年的婚姻生活中，她千方百计想让父子团聚。
V-ERG
（使）统一;（使）重新团结
If a divided organization or country is reunited, or if it reunites, it becomes one united organization or country again.
例句
...a federation under which the divided island would be reunited...将使这个分裂的岛屿实现统一的联邦政府His first job will be to reunite the army.他的首要任务将是使军队重新团结一心。