interlocutor

Etymology 1

A noun-form of Latin interloquor (“speak between, issue an interlocutory decree”), from inter- + loquor (“speak”).

noun

1. A person who takes part in dialogue or conversation.
   Explanations which continually remind one's interlocutor of one's ignorance are a great damper upon the easy flow of talk. 1894, Calvin Thomas, “The Teacher's Outfit in German”, in The School Review, volume 2, number 7, page 406
2. A man in the middle of the line in a minstrel show who questions the end men and acts as leader.
   The "interlocutor" greeted the audience and engaged in comical repartee with the "end men," named Tambo and Bones. 1991, Maureen Costonis, “Martha Graham's American Document: A Minstrel Show in Modern Dance Dress”, in American Music, volume 9, number 3, page 299
3. (law) An interlocutory judgement or sentence.

Etymology 2

From French interlocutoire, from Latin interlocūtōrium.

noun

1. (Scotland, law) A decree of a court.
   A decree of the English Court of Chancery is not entitled to more respect in Scotland than a decree (interlocutor) of the Scottish Court of Session in England. 1869, “The Judicial System of Scotland”, in The American Law Register (1852-1891), volume 17, number 5, page 257