1. brotherhood, kinship, family relationship, relationship

usage: the kinship relation between a male offspring and the siblings

2. brotherhood, fraternity, sodality, class, stratum, social class, socio-economic class

usage: people engaged in a particular occupation; "the medical fraternity"

3. brotherhood, friendliness

usage: the feeling that men should treat one another like brothers

4. union, labor union, trade union, trades union, brotherhood, organization, organisation

usage: an organization of employees formed to bargain with the employer; "you have to join the union in order to get a job"

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See also: brotherhood (Dictionary)