I wasn't familiar with this term until I came across it in this PartiallyClips comic: http://partiallyclips.com/2013/06/17/flowers-at-work-2/ and looked it up on Wikipedia: http://en.wikipedia.org/wiki/Exposition_(narrative) It actually describes something that amuses and annoys me on so many US TV shows, as when the CSI guys explain to each other exactly the process they are use ("and now I'm going to run the fingerprints through the database"). I keep waiting for one of them to say, "Yes, of course you are. You always do. That's your job. Why are you telling me this? Do you think I don't know what goes on in a CSI lab? I've been working here 15 years, forgodsake!"