quiddity ['kwɪdɪtɪ]

例句:

• As people, the three characters have no personal quiddity, no individual tincture.
  来自Daily Telegraph
• The critic needs a sense of the work's quiddity or essence, its individuality.
  来自H. Gardner
• Where do you start if you are an academic philosopher in search of the quiddity of bullshit?
  来自NEWYORKER