n.

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

   卡車沿著陡峭的道路往下開時，衝力愈來愈大。

2. 氣勢，衝力[U]
   a campaign that gained momentum

   勢頭增大的一場運動

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

   在任何一種運動比賽中，建立推動力是非常重要的。

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.