1. A group of criminals or hoodlums who band together for mutual protection and profit.
2. A group of adolescents who band together, especially a group of delinquents.
3. Informal A group of people who associate regularly on a social basis: The whole gang from the office went to a clambake.
4. A group of laborers organized together on one job or under one foreperson:
5. A matched or coordinated set, as of tools