I am not an NP, but am an experienced RN. I have always hated the term "midlevel" and discourage it's use among my coworkers. mainly I hate it because what does it imply about us nurses?
I found this brief article written by a pediatrician that expresses my views very well. Some of you might find it interesting.
http://www.kevinmd.com/blog/2014/07/stop-calling-nurse-practitioners-mid-level-providers.html