n.

1. 標記法[U]
   Music has a special system of notation.

   音樂有一套專用的標誌法。

2. 記號，標誌；樂譜；棋譜符號[C][S1]
3. 註釋；批註；記錄[C]
   He made a notation on his engagement calendar.

   他在約會日程上作了記載。

n.

1. a system of written symbols used to represent numbers, amounts, or elements in a field such as music or mathematics.
2. an annotation.