a.

1. 【语】单数的[Z]
   "One boy" is singular; "two boys" is plural.

   “一个男孩”是单数，“两个男孩”是复数。

2. 单一的；独个的[Z]
3. 非凡的，卓越的
   She was a lady of singular beauty.

   她长得美丽非凡。

4. 异常的；奇异的
   I had a singular experience in Africa.

   我在非洲时有过一次奇特的经历。

n.

1. 【语】单数（形）[U][the S]
   The singular of "mice" is "mouse".

   “mice”的单数形是“mouse”。

adj.

1. Grammar  (of a word or form) denoting or referring to just one person or thing.
   ▸single; unique.
2. exceptionally good or great; remarkable.
   ▸strange or eccentric in some respect.
3. Mathematics  (of a square matrix) having a zero determinant.
4. Physics  & Mathematics  relating to or of the nature of a singularity.

n.