MOVEMENT – 1) The manner in which the horse moves over the ground: way of moving.
2) Test movement: a section of a dressage test to be evaluated with one score on a score sheet.
3) Dressage Movements: these are: leg-yield, rein back, shoulder-in, travers, renvers, turn on haunches, half pass (trot or canter), flying change(s), pirouette (walk or canter), piaffe, and passage.
For the purpose of the current freestyle tests, forbidden movement(s) refers to #2.
Full glossary: http://bit.ly/2019USDFGlossary