n.[U]

1. 明亮；明淨
   The mountains had an ethereal hue with a clearness almost polar in its severity.

   這些群山有一種永恆的色彩，明亮的程度近乎於極地。

2. 明晰，明確
   The general gave his orders with such clearness and precision, and at the same time was always affable with every one.

   將軍很明晰準確地下達了命令，但同時又對大家和藹可親。