conversation [conversations](expression and exchange of individual ideas through talking with other people) noun [UK: ˌkɒn.və.ˈseɪʃ.n̩] [US: ˌkɑːn.vər.ˈseɪʃ.n̩]
dialogue(conversation or other discourse between individuals) noun [UK: ˈdaɪə.lɒɡ] [US: ˈdaɪə.ˌlɒɡ]
interlocution(Discussion or conversation) noun [UK: ˌɪn.tə.ləʊ.ˈkjuː.ʃən] [US: ɪn.tər.lə.ˈkjuː.ʃən]