# Definition:Join

## Disambiguation

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**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.