团圆的英文：
reunion

Formerly, used of daughter-in-law raised from childhood in the family
团圆媳妇

"On the fifteenth the moon is full, bathing jade balustrades with her pure light. "
"时逢三五便团圆,满把晴光护玉栏."

"Reunions with family and friends tend to be emotional, too"
与家人团圆或与朋友相聚时,他们也会十分激动

The form is immaterial——the important thing is the presence of all family members.
形式不重要，最重要的是一家人要团圆，可见传统是可以改变的。

How joyous was that reunion!
久别重逢是多么令人欣喜啊！

We are having a class reunion.
我们要开同学会了。

We had a family reunion.
我们搞了一次家庭团聚。

The Association holds an annual reunion.
这个协会每年聚会一次。

Emotional,touching,etc reunions
令人感动的、激动的...团聚