1.Someone who takes part in a conversation, often formally or officially.

2.The performer in a minstrel show who is placed midway between the end men and engages in banter with them.

 Source: The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2000 by Houghton Mifflin Company.

interlocutor

1. One who takes part in dialogue or conversation; a talker, interpreter, or questioner. --Jer. Taylor.

2. (Law) An interlocutory judgment or sentence.

 Source: Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.

 interlocutor

n 1: the performer in the middle of a minstrel line who engages the others in talk [syn: middleman] 2: a person who takes part in a conversation [syn: conversational partner]

 Source: WordNet ® 1.6, © 1997 Princeton University

But the events of the next few hours will demonstrate that there inheres yet another wrinkle to what the pericope and Pilate's examination reveal as irony's ethical dimension. By turning away from his interlocutee after asking his sardonic question, Pilate pinpoints the distinction between mere mockery and the revelatory irony Jesus employed to disperse the crowd in the pericope. In this context, mockery is irony's pale and ineffectual shadow, as is illustrated when Jesus, mocked and scourged as the "King of the Jews," truly has his body broken and actually dies on the cross.