Quintessence

The word quintessence is used in different fields:

In physics, quintessence is a hypothetical form of energy postulated to exist as a possible explanation of observations of an accelerating universe.
In alchemy, quintessence, meaning "fifth element", was another term for ether; it is the substance of which the heavenly bodies were supposed to be composed.
Quintessenz (German for "quintessennce") is an Austrian on-line civil liberties advocacy organization.

Quintessence and the corresponding adjective quintessential are also used in the figurative sense of "(a thing) that is the perfect example of its kind".

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Quintessence

See also: Quintessence, Alchemy, Austria, Civil liberties, Ether, German language, Physics, Quintessence (alchemy), Quintessence (physics)