I'd never heard anyone say this word until about six months ago, and now it's all over the place.
It's a horrible tinny little word, too, like a very cheap clockwork train going over some very rickety points.
(You say it INterLOCerta.)
All it means is someone who takes part in a conversation - and it's far too grand a word for that. Questioner or interviewer or even interviewee must be preferable (though interviewee is pretty nasty, too).
An interlocutor can also be the front man in a troupe of minstrels - the one who does the announcements and engages the others in conversation.
If you're in Scotland, it can be a decree by a judge.
I just wish a judge would make a decree to throw it into jug for a long long time.
Word Not To Use Today: interlocutor. This foul word is annoying enough to pollute the atmosphere with no fewer than three feminine forms: -tress, -trice and -trix. Curse it!
This word is made up of the Latin inter, which means between or among or together, and loquī, to speak.