a.

1. 特有的，獨特的；典型的；表示特性的[（+of）]
   Urban inhabitants have to live with the characteristic noises of cities.

   城市居民不得不忍受都市特有的喧囂。

   Quick decision is characteristic of him.

   快速決定是他的特徵。

n.[C]

1. 特性，特徵，特色
   It is their distinguishing characteristic.

   這是他們與眾不同的特徵。

2. 【數】（對數的）首數
   The characteristic of the logarithm 6.3214 is 6.

   對數6.3214的首數是6。

adj.

n.

1. a feature or quality typical of a person, place, or thing.
2. Mathematics  the whole number or integral part of a logarithm.