The term ROTARY encompasses a broad range of movements.  I break it into two categories.  The first is doing something that applies a rotary force to the skis that physically twists/turns them in a new direction (some call this active rotary).  The second group is rotary movements that are used to simple put the body in functional positions while carving turns (some call this Passive Rotary), but applies no direct turning/twisting force to the ski.  Examples would be assuming countered positions.