1. 典范;典型
    The quintessence of something is the most perfect or typical example of it.

2. 精髓;精华;本质
    The quintessence of something is the aspect of it which seems to represent its central nature.

1. the most typical example or representative of a type

2. the purest and most concentrated essence of something

3. the fifth and highest element after air and earth and fire and water
    was believed to be the substance composing all heavenly bodies

    Synonym: ether