a.

1. 立即的，即刻的
   The telegram asked for an instant reply.

   這封電報要求立即回覆。

2. 緊迫的，迫切的；迫在眉睫的
   The flood victims were in instant need of help.

   水災難民急需救助。

3. （食品）速食的；即溶的
   He often eats out at an instant Chinese restaurant.

   他常在一家中式快餐館吃飯。

4. 本月的

n.

1. 頃刻，一剎那[S1]
   An instant later the explosion occurred.

   一會兒之後，爆炸就發生了。

adj.

1. happening immediately.
   ▸(of food) processed to allow quick preparation.
2. dated urgent; pressing.
3. [postpos.] dated (in business letters) of the current month:
   your letter of the 6th instant.
4. archaic of the present.

n.

1. a precise moment of time.
2. a very short time.