[mass noun]the relationship between brothers 兄弟关系 ■the feeling of kinship with and closeness to a group of people or all people 手足情谊 a gesture of solidarity and brotherhood. 一种团结一致和注重手足情谊的姿态。
association, society, or community of people linked by a common interest, religion, or trade 协会;修士会;同业公会 a religious brotherhood. 宗教修士会。 ■(N. Amer.)a trade union (北美)工会
语源
Middle English : probably from obsolete brotherred (based on Old English -ǣden 'condition, state'; compare with Kindred). The change of suffix was due to association with words ending in -hood and -head