1. a social organization of male students at a college or university
2. a group of people sharing common interests or beliefs
3. the quality or state of being brotherly; brotherhood

Examples

• He joined a fraternity during his sophomore year at college.
• The fraternity organized a charity fundraiser for the local food bank.
• There’s a strong fraternity among the firefighters in our town.
• The medical fraternity has strict ethical guidelines.
• The fraternity between the two nations grew stronger after the treaty.
• Members of the fraternity wore matching jackets to the game.