What is the meaning of join?

noun

• The shape or manner in which things come together and a connection is made.
  • synonyms: articulation, joint, juncture, junction
• A set containing all and only the members of two or more given sets.
  • usage: "let C be the union of the sets A and B"
  • synonyms: union, sum

verb

• Become part of; become a member of a group or organization.
  • usage: "He joined the Communist Party as a young man"
  • synonyms: fall in, get together
• Cause to become joined or linked.
  • usage: "join these two parts so that they fit together"
  • synonyms: bring together
• Come into the company of.
  • usage: "She joined him for a drink"
• Make contact or come together.
  • usage: "The two roads join here"
  • synonyms: conjoin
• Be or become joined or united or linked.
  • usage: "The two streets connect to become a highway"; "Our paths joined"; "The travelers linked up again at the airport"
  • synonyms: connect, link, link up, unite