Senses
同堂 to live under the same roof
To live in the same house or share a household, usually used of different generations of a family.
同堂 paternal cousin relationship
Relating to brothers or cousins who share the same grandfather but have different fathers
同堂 schoolmate
(literary) A classmate or schoolmate
同堂 to be in the same hall
To be present together in the same hall or room