The term aether, æther or ether may refer to one of the following.

• The original meaning: Aether (mythology), the personification of the "upper sky", space and heaven, in Greek mythology.

Science, engineering, and philosophy:

• The Aether of classical elements is a concept, historically, used in science (as a medium) and in philosophy (as a substance).
  • Any number of Aether theories in alchemy, natural philosophy, and modern physics which suppose a "fifth element".
  • Luminiferous aether, in early physics considered to be the medium through which light propagates
• Ether, a class of chemical compounds, or specifically:

• Diethyl ether, which has the common name "ether"

  • Ether (routing), in internet routing, the term ether is associated with hosts

• Ether may be used as slang for Ethernet or Ethernet address

Esotericism:

• Etheric plane, a finer grade of matter, "ether" in addition to the solids, liquids, and gases - which permeates the subatomic structure of the earth and its atmosphere; see Aether theories.
• Etheric body, a sort of life force body or aura that constitutes the "blueprint" of the physical body, and which sustains the physical body.

Gaming:

• Ether can be found in the Pokémon video games, where it is used to restore the Power Points of Pokémon
• Ether is the system of spells used in the computer role-playing game Xenogears
• Ether is an item used to restore magic points in the Final Fantasy series, the Kingdom Hearts series and Chrono Trigger.
• Aether (fictional planet), the setting for Retro Studios' Metroid Prime 2: Echoes game for the Nintendo GameCube.

Other:

• Ether (prophet)
• Ether', a reference to the Book of Ether
• Ether (song), a 2001 song by American rapper Nas

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