n.

1. 下定义；定义；释义[U][C]
   the definitions in a dictionary

   词典中的字义

2. 限定；定界；规定[U][C]
   The club must give a clear definition of its goals.

   俱乐部应对其宗旨作明确规定。

3. （轮廓等的）清晰[U]
4. （透镜等的）分辨率[U]
5. 【物】【摄】清晰度[U]
   This photograph lacks definition.

   这张相片不清晰。

n.

1. a formal statement of the exact meaning of a word.
   ▸an exact description of the nature, scope, or meaning of something.
   ▸the action or process of defining.
2. the degree of distinctness in outline of an object or image.