Does anyone have an entry for this word?
Richard Stengel discusses it in his book "You're Too Kind: A Brief History of Flattery" in the context of Hellenic ideas about democracy and freedom of speech.
He explains that it means "frankness of speech", in opposition to demagoguery.
In the fifth century B.C., "parhesia" was the term the Greeks used for free speech. The idea was that a free man speaking before his fellow citizens was to speak freely, truthfully, sincerely. Frank speech was transparent speech. Parhesia was regarded as a foundation of democracy. It was both a right and a necessity. Parhesia was the unpleasant truth, not the pleasing fiction. The Greeks believed a democracy could survive only if men were truthful and frank.
Edit: Never mind. Stengel spells it with one r. But here it is with two:
Parrhesia 
