See:
Understand Alignment (Line of Dance)
Dancing is blending of the following actions in different degrees, created by either leg or body action:
Progression - leg action
Basic action: forward, back and side.
Turn and Rotation - body action
Rotation
body turning (without feet moving). Maximum rotation is max body can do around spine (spine not moving) without involving feet
Feet swivel: try without involving shoulder, hip slightly rotates, but only as much it needs
Turn - body turning with partner
Lowering - leg action
without change body posture
Rising - leg action
Foot rise: use ankle joint
Body rise: straightening knee
Sway - body action
curvature of the spine is maintained when swaying. don't just sway arms.
sway is often done together with rotation
Bar/Measure: A bar is a part of the music that starts with an accented beat and finishes right before the next accented beat. (bar lines on musical sheet)
Rhythm/Time Signature: how many beats in each measure/bar. Example: 1 2 3 vs SSQQ
Tempo: speed of music, i.e. the speed beat is played, how many beats per minute.
Travel direction and foot alignment may or may not be the same.
Foot alignment could be Diagonal Center, but traveling direction could be Line of Dance.
Turn is for the feet. Rotation is hip relative position to feet.