in ‧ ter ‧ loc ‧ u ‧ tor /ˌɪntəˈlɒkjətə, ˌɪntəˈlɒkjʊtə $ ˌɪntərˈlɑːkjətər/ BrE AmE noun [countable] formal
[ Date: 1500-1600 ; Language: Modern Latin ; Origin: Latin interloqui , from loqui 'to speak' ]
your interlocutor is the person you are speaking to