1. Pronounced "ah-kash." Sanskrit word that has been adopted in the West as the name for the fifth magical element. It means aether or spirit.
2. (Sanskrit) See Spirit. The fifth element of Spirit or Ether, one of the five tattvas or elemental forces—the others beingAir, Fire, Water, and Earth, which are derived from Spirit. It is symbolized by an indigo egg shape, and is associated with Vishudda, the throat chakra. It manifests as sound, but is not sound. It is all-pervading Space without dimension. Compare to the alchemical “Quintessence.”