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Noun
- a set containing all and only the members of two or more given sets
- let C be the union of the sets A and B
- the shape or manner in which things come together and a connection is made
Verb
- be or become joined or united or linked
- The two streets connect to become a highway
- The travelers linked up again at the airport
- make contact or come together
- come into the company of
- She joined him for a drink
- cause to become joined or linked
- join these two parts so that they fit together
- become part of; become a member of a group or organization
- He joined the Communist Party as a young man