The term "principal interlocutor" is correct and usable in written English.
It is typically used to refer to the main person involved in a conversation or discussion. Example: "The principal interlocutor in the negotiations was the CEO of the company." In this sentence, the term is used to indicate that the CEO was the main person responsible for communicating and making decisions during the negotiations.
My principal interlocutor in this exercise is the Marxist literary theorist and historical materialist Walter Benjamin.
"We do onstage the things that are supposed to happen off," says Mr. Stoppard's Player, Rosencrantz and Guildenstern's principal interlocutor, encapsulating Mr. Stoppard's method.
Mr. Ahern, considered the principal interlocutor with Sinn Fein and its I.R.A. allies, added, "I'd be very disappointed if the response from the paramilitaries was not extremely positive".
But, in the Republic, he puts into the mouth of its principal interlocutor, "Socrates," an observation about the corrosive power that philosophy can have when it takes hold at too early an age.
Consequently, throughout the six decade-long U.S.-Pakistan relationship, Pakistan's army has been the principal interlocutor with America, both because of its domestic heft and because military rulers were at the helm in periods when the United States needed Pakistan most.
Plato continues to use a figure called "Socrates" as his principal interlocutor, and in this way he creates a sense of continuity between the methods, insights, and ideals of the historical Socrates and the new Socrates who has now become a vehicle for the articulation of his own new philosophical outlook.
It is important to note that Mr. Ferguson's principal interlocutors were not, at the time, critics of the Bush administration's policies in Iraq but rather people who had, often at considerable professional cost and personal risk, committed themselves to fulfilling those policies.
The principal interlocutors are men of military experience, Laches and Nicias.
But their contemporary and principal interlocutors are Epicureans, Stoics, Cynics, and Megarian logicians (cf. Long 2006, ch. 4 and 5).
If we take Plato to be trying to persuade us, in many of his works, to accept the conclusions arrived at by his principal interlocutors (or to persuade us of the refutations of their opponents), we can easily explain why he so often chooses Socrates as the dominant speaker in his dialogues.
"At some point, Turkey could be ready to give up its frustrating and humiliating role as a beggar pleading for membership in the West and to resume its much more impressive and elevated historical role as the principal Islamic interlocutor and antagonist of the West".
