Definition of "Join" :

noun: a set containing all and only the members of two or more given sets

noun: the shape or manner in which things come together and a connection is made

verb: make contact or come together

"The two roads join here."

verb: cause to become joined or linked

"Join these two parts so that they fit together."

verb: become part of; become a member of a group or organization

"He joined the Communist Party as a young man."

verb: come into the company of

"She joined him for a drink."

verb: be or become joined or united or linked

"Our paths joined."