Union

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Union generally means that two or more things are joined into one. That can be an organization of several people or organizations, several objects combined into one, and so on. The term may mean:
In education.
The term student union can be used in either of two senses:
In the United States, the phrase more commonly refers to the building. The phrase "student government" or "student senate" is usually used when referring to the subject of the "Students' union" article.