n.

1. 本质
   The quiddity of this company is service at low price.

   这家公司的本质就是廉价服务。

2. 借口；强辩
   She resorted to using quiddities to win this debate.

   她用诡辩的方式赢得了这场辩论。

3. 怪癖
   She said that some of her husband's quiddities were quite unbearable to her.

   她说她的丈夫的一些怪癖让她无法忍受。

n.