Definitions are good but no dance app should be without visual aids that start with the beginning of a movement and flow through to the end of the movement. This app says it has images for some terms but there is no way of knowing which ones. I would be more patient with the development of this app if I could easily go to the terms with images since I would mostly gravitate toward those. Save your money for this app or another app until they get a professional dancer on video for every term. I would spend good money on the app that does that.
KeMey about Ballet Index