n.

1. 【物】动量，冲量[U][C]
   The truck gained momentum as it rolled down the steep road.

   卡车沿着陡峭的道路往下开时，冲力愈来愈大。

2. 气势，冲力[U]
   a campaign that gained momentum

   势头增大的一场运动

3. 动力；推动力[U][S1]
   Building momentum is very important in any kind of sports games.

   在任何一种运动比赛中，建立推动力是非常重要的。

n.

1. the impetus gained by a moving object.
   ▸the driving force gained by the development of a process:

   the investigation gathered momentum.
2. Physics  the quantity of motion of a moving body, equal to the product of its mass and velocity.