From Longman Dictionary of Contemporary Englishinterlocutorin‧ter‧loc‧u‧tor /ˌɪntəˈlɒkjətə $ ˌɪntərˈlɑːkjətər/ noun [countable] formal PERSON/PEOPLETALK TO somebodyyour interlocutor is the person you are speaking toOrigin interlocutor (1500-1600) Modern Latin Latin interloqui, from loqui “to speak”