In Hinduism Akasha means the basis and essence of all things in the material world; the first material element created from the astral world (Air, Fire, Water, Earth are the other four in sequence). It is one of the Panchamahabhuta, or "five elements"; its main characteristic is Shabda (sound). In Sanskrit the word means "space", the very first element in creation. In Hindi, Marathi and Gujarati, and many other Indian languages, the meaning of Akasha has been accepted as sky.
The Nyaya and Vaisheshika schools of Hindu philosophy state that Akasha or ether is the fifth physical substance, which is the substratum of the quality of sound. It is the One, Eternal, and All Pervading physical substance, which is imperceptible.
According to the Samkhya school of Hindu philosophy, Akasha is one of the five Mahābhūtas (grand physical elements) having the specific property of sound.
Akasha is space in the Jain conception of the cosmos. It falls into the Ajiva category, divided into two parts: Loakasa (the part occupied by the material world) and Aloakasa (the space beyond it which is absolutely void and empty). In Loakasa the universe forms only a part. Akasha is that which gives space and makes room for the existence of all extended substances.
Adherents of the heterodox Cārvāka or Lokāyata philosophy of India hold that this world is made of four elements only. They exclude the fifth element, Akasha, because its existence cannot be perceived.
The Western religious philosophy called Theosophy has popularized the word Akasha as an adjective, through the use of the term "Akashic records" or "Akashic library", referring to an ethereal compendium of all knowledge and history.
It is believed by many modern Pagans that the Akasha, Spirit, is the Fifth Element. Scott Cunningham describes the Akasha as the spiritual force that Earth, Air, Fire, and Water descend from. Some also believe that the combination of the four elements make up that which is Akasha, and that Akasha exists in every living creature in existence; without Akasha, there is no spirit, no soul, no magic.
The Five Elements are worked with to create positive changes on earth. This is done through meditation to bring about beneficial changes in one's life. Akashan spirituality is holistic.
Practitioners learn to maintain mental and physical health through meditation, exercise, ritual and diet. They are expected to have a profound commitment to their life path.
The upward point of the pentacle, the pentagram or five pointed star within a circle, represents Akasha. The others represent Fire, Earth, Air and Water. While Earth is considered "north"; Fire is "south"; air is "east"; Water is "west", while Akasha is "center".
In the Black Library novel Mechanicum, the Theosophic idea of Akashic records is referenced, in this case as an underlying universal substrate which contains the secrets behind all possible forms of technology. Adept Koriel Zeth attempts to build a device called an Akashic Reader to access this information.
In the book Science And The Akashic Field by Ervin Laszlo, Akasha is noted as the aether from which all matter is formed.
In Tsukihime and Fate/stay night visual novels, Akasha is the Root, the source and the end of everything in the universe.
Akasha is a Rock Band from Costa Rica, the band has shared stage with bands such as P.O.D. and Korn.
In the anime series Code Geass, the Emperor of the Britannian Empire built a shrine-like building called the Sword of Akasha, which was described as a "weapon to defeat god". The concept of god is later discussed as the collective-unconscious of every person on earth.
The "Akasha field" is used in the television series Eureka. It is believed to be a field of universal knowledge and is somehow connected to the terrestrial artifact in the Global Dynamics labs.
In the Arcana Evolved roleplaying game, Akashic is the name of a character class that taps into collective memory to gain knowledge.
In TERA Online, the MMORPG, Akasha (Goddess of Epidemics) is the name of a L50 final boss in Akasha's Hideout.
In Dota 2, a real-time, action strategy game, a playable hero is named Akasha, the Queen of Pain.
In Shin Megami Tensei: Devil Survivor 2, a Japanese RPG, the extradimensional being Polaris has access to and control over all the Akashic records for our universe, and can edit them (and thus the universe) at will.