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quintessence 
  n 
1 the most typical representation of a quality, state, etc. 
2 an extract of a substance containing its principle in its most concentrated form 
3 (in ancient and medieval philosophy) ether, the fifth and highest essence or element after earth, water, air, and fire, which was thought to be the constituent matter of the heavenly bodies and latent in all things 
  (C15: via French from Medieval Latin quinta essentia the fifth essence, translation of Greek pempte ousia) 
 quintessential  adj 
 quintessentially    adv 

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