(Sanskrit) One of the eight major powers (siddhis) of a spiritually developed person.

“The power to decrease the weight of the physical body to that of a feather.  We can float in the air with the physical body, thanks to this power.” - Samael Aun Weor, The Aquarian Message

“He (the initiate) can make his body as light as cotton or feather. Vayustambhanam is done through this Siddhi. In Jalastambhanam also the power is exercised to a very small degree. The body is rendered light by Plavini Pranayama. The Yogi produces a diminution of his specific gravity by swallowing large draughts of air. The Yogi travels in the sky with the help of this Siddhi. He can travel thousands of miles in a minute.” - Swami Sivananda, Kundalini Yoga