Tattva – Mahābhūta, Panchikarana
Wŭ Xíng (五行)
The Sanskrit word is derived from a root kāś meaning "to be visible". It appears as a masculine noun in Vedic Sanskrit with a generic meaning of "open space, vacuity". In Classical Sanskrit, the noun acquires the neuter gender and may express the concept of "sky; atmosphere" (Manusmrti, Shatapathabrahmana). In classical Vedantic Hindu philosophy, the word acquires its technical meaning of "an ethereal fluid imagined as pervading the cosmos". In many modern Indo-Aryan languages, the corresponding word (often rendered Akash) retains a generic meaning of "sky".
In Vedantic Hinduism, Akasha means the basis and essence of all things in the material world; the first material element created from the astral world. A Vedic mantra “pṛthivyāpastejovāyurākāśāt” indicates the sequence of initial appearance of the five basic gross elements. Thus, first appeared the space, from which appeared air, from that fire or energy, from which the water, and therefrom the earth. It is one of the Panchamahabhuta, or "five gross elements"; its main characteristic is Shabda (sound). The direct traslation of Akasha is the word meaning "upper sky" or 'space' in Hindu.
The Nyaya and Vaisheshika schools of Hindu philosophy state that Akasha or aether 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.
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.
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.
Ervin László in Science and the Akashic Field: An Integral Theory of Everything (2004), based on ideas by Rudolf Steiner, posits "a field of information" as the substance of the cosmos, which he calls "Akashic field" or "A-field".
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