a.

1. 兄弟的；兄弟般的
   fraternal love

   手足之情

2. 友好的，友爱的
   We sent our fraternal greetings to the conference.

   我们向会议致以友好的问候。

adj.

1. of or like a brother or brothers.
2. of or denoting a fraternity.
3. (of twins) developed from separate ova and therefore not identical.