形容詞 fraternal:

1. of or relating to a fraternity or society of usually men
2. (of twins) derived from two separate fertilized ova
   同義詞：biovular
3. like or characteristic of or befitting a brother
   同義詞：brotherly, brotherlike

1. A close fraternal tie.
   親密的兄弟情誼
2. An organization of people united by a common fraternal bond or social aim.
   兄弟會(huì)由共同的兄弟情誼或社會(huì)目的而結(jié)合起來的民間組織
3. The party sent its fraternal greetings to the trade union meeting.
   黨向工會(huì)大會(huì)致以親切的問候。

fra.ter.nal

adj.（形容詞）

Of or relating to brothers:
兄弟的：屬于或關(guān)于兄弟的：
例句：
a close fraternal tie.
親密的兄弟情誼

Showing comradeship; brotherly.
顯出同志之誼的；兄弟的
Of or constituting a fraternity:
兄弟的：屬于或組成兄弟的：
例句：
a fraternal association.
兄弟會(huì)的社團(tuán)

Biology Of, relating to, or being a twin developed from two separately fertilized ova; dizygotic.
【生物學(xué)】 異卵雙生的：由兩個(gè)分別受精的卵子生出的雙胞胎的；由兩個(gè)卵生出來的相象的人或物

來源：
Middle English
中古英語
from Old French fraternel
源自 古法語 fraternel
from Medieval Latin fr3tern3lis
源自 中世紀(jì)拉丁語 fr3tern3lis
from Latin fr3ternus
源自 拉丁語 fr3ternus
from fr3ter [brother] * see bhr3ter-
源自 fr3ter [兄弟] *參見 bhr3ter-

【引伸】
frater.nalism
n.（名詞）
frater.nally
adv.（副詞）