I hadn't seen this post when I wrote that, Cassius, so I didn't realize you had already delved into the etymology. I wouldn't have recognized the Greek term in the first place if Greenblatt had not discussed it in the Getty lecture, at the 15:00 mark in this video. So that's a good place to start. I notice from your post that it was used in that sense in the book of Ecclesiastes. That's earlier than I would have supposed.