< quintessence (kwin-TES-ens) noun
1. The pure, concentrated essence.
2. Most perfect embodiment of something.
[From Middle French quinte essence, from medieval Latin quinta essentia (fifth essence).] Ancient Greeks referred to the aither of Aristotle as pémpte ousia, the fifth essence.>

I don't see indo-european root here, but Greek word *pempte* sounds similar to russian "pyat'"(transliterated),
means "five". And we also have the word "efir" from aither.

Viktor V. Trukov

Viktor V. Trukov