interlocution (n.)

"interchange of speech, dialogue, action of talking and replying," 1530s, from Latin interlocutionem (nominative interlocutio) "a speaking between, interlocution," noun of action from past participle stem of interloqui "to speak between; to interrupt," from inter "between" (see inter-) + loqui "to speak" (from PIE root *tolkw- "to speak").