Akasha, the space or sky or æther in traditional Indian cosmology - depending on the religion.
The word in Sanskrit is derived from a root kāś meaning "to be". It appears as a masculine noun in Vedic Sanskrit with a generic meaning of "open space, vacuity".
In Vedantic Hinduism, akasha means the basis and essence of all things in the material world; the first element created.
In Buddhist phenomenology, akasha is divided into limited space (ākāsa-dhātu) and endless space (ajatākasā).