# Definition:Join

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## Disambiguation

This page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.

**Join** may refer to:

- Group theory:
- Join of Subgroups: the subgroup formed by the union of two subgroups.

- Order Theory
- Join (Order Theory): the supremum of the set formed by two elements of an ordered set.

- Graph Theory
- Join (Graph Theory): an edge
**joins**two vertices of a graph.

- Join (Graph Theory): an edge

- Set Theory
- A term (rarely used nowadays) for set union.