Ha - Sun (masculine) Static
Tha - Moon (feminine) Dynamic
Vinyasa - Continuous (flowing) Movement (breath & body)
Yoga - Union

Hatha Vinyasa Yoga is the art of uniting opposite aspects of self via of the continuous movement of breath & body.

It incorporates principles of Hatha yoga with those of Pranayama yoga.

http://tribes.tribe.net/hathavinyasasf