Levitation – The ability to fly straight up minus the ability to move in any other direction. Below is a picture showing the Ancient One doing it Tibet style! Notice he doesn’t start flying out of the direction of the attack because minus some other artifacts like the confusingly named Cloak of Levitation, he cannot truly fly.
The following picture explains the levitation trick!
Phaerimm – TSR 2166 Monstrous Compendium Annual Volume 3