join join /ˈdʒɔɪn/

noun

1. A set containing all and only the members of two or more given sets  ( join , sum , union )
   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
   let C be the union of the sets A and B
   
2. The shape or manner in which things come together and a connection is made  ( articulation , join , joint , junction , juncture )
   the shape or manner in which things come together and a connection is made
   

verb

1. () Become part of; become a member of a group or organization  ( fall in , get together , join )
   become part of; become a member of a group or organization
    He joined the Communist Party as a young man
   He joined the Communist Party as a young man
   
2. () Cause to become joined or linked  ( join )
   cause to become joined or linked
    Join these two parts so that they fit together
   join these two parts so that they fit together
   
3. () Come into the company of  ( join )
   come into the company of
    She joined him for a drink
   She joined him for a drink
   
4. () Make contact or come together  ( conjoin , join )
   make contact or come together
    The two roads join here
   The two roads join here
   
5. () Be or become joined or united or linked  ( link up , unite , join , connect , link )
   be or become joined or united or linked
    The two streets connect to become a highway
   The two streets connect to become a highway
    Our paths joined
   Our paths joined
    The travelers linked up again at the airport
   The travelers linked up again at the airport