n.

1. 兄弟關係；手足之情[U]
   Soldiers who are fighting together often have a strong feeling of brotherhood.

   一起作戰的士兵相互間常懷有深厚的兄弟情誼。

2. 同志關係[U]
3. 兄弟會；同志會；同業公會；修士會[C]
4. （總稱）同行，同業；會友[the S][G]
   the medical brotherhood

   醫務界

5. 四海之內皆兄弟的信念

n.

1. the relationship between brothers.
   ▸a feeling of kinship and closeness.
2. an association or community of people with a common interest, religion, or trade.
   ▸N. Amer. a trade union.