1. the relationship between brothers
2. a feeling of friendship and mutual support between people
3. an organization of men united by a common interest or purpose

Examples

• The two brothers shared a strong brotherhood that lasted their entire lives.
• The soldiers developed a deep sense of brotherhood during their time in combat.
• The firefighters spoke of the brotherhood among their ranks.
• He joined a religious brotherhood dedicated to helping the poor.
• The labor union promoted brotherhood among all workers.
• Their shared experiences created an unbreakable brotherhood.
• The fraternal brotherhood organized charity events for the community.