n.

1. 不在，缺席[U][C][（+from）]
   She never speaks ill of anyone in his or her absence.

   她從不乘人不在時說別人的壞話。

2. 缺少，缺乏[U][（+of）]
   The absence of color in that drawing makes it dull.

   那幅畫因沒有著色而顯得晦暗。

n.

1. the state of being away from a place or person.
2. (absence of) the non-existence or lack of.