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