union

noun: the condition of being united or combined into a single entity
- The union of the two companies created a stronger organization.
noun: the formal joining of two individuals in marriage or a partnership
- Their union was celebrated with a small ceremony.
noun: a labor organization formed by workers to protect and advance their collective interests
- The workers formed a union to fight for higher wages and safer conditions.
noun: the act of forming an alliance or coalition among groups or nations
- The European Union is a political and economic union of member states.
noun: a device for connecting parts, such as in plumbing or machinery
- The plumber installed a new union to connect the pipes.