A union is a workers' organization which represents its members and which aims to improve things such as their working conditions and pay.

When the union of two or more things occurs, they are joined together and become one thing.

When two or more things, for example countries or organizations, have been joined together to form one thing, you can refer to them as a union .

The marriage of two people is sometimes referred to as a union .

Union is used in the name of some clubs, societies, and organizations.