n.

1. 衝動，一時的念頭[C][U]
   My uncle bought the house on an impulse.

   我叔叔一時衝動買下了那房子。

   I used to act out of blind impulse when I was young.

   我年輕時常憑盲目的衝動行事。

2. 推動力；刺激[C]
   The signing of the agreements will give an impulse to trade between the two countries.

   這些協議的簽訂會促進兩國間的貿易。

3. 【生理】神經衝動；【電】脈衝[C]

n.

1. a sudden strong and unreflective urge to act.
2. an impetus.
3. a pulse of electrical energy; a brief current.
4. Physics  a force acting briefly on a body and producing a change of momentum.