con ‧ join /kənˈdʒɔɪn/ BrE AmE verb [intransitive and transitive] formal
[ Date: 1300-1400 ; Language: Old French ; Origin: conjoindre , from Latin conjungere , from com- ( ⇨ COM- ) + jungere 'to join' ]
to join together, or to make things or people do this