a.

1. 嚴守時刻的；準時的[（+for/in）]
   He is always very punctual.

   他總是非常準時。

2. （表達方式等）正確的；精確的
3. 點狀的

adj.

1. happening or doing something at the appointed time.
2. Grammar  of or denoting action that takes place at a particular point in time. Contrasted with durative.