n.[U]

1. （船等的）前进
   The ship made little headway in the storm.

   航船在暴风骤雨中几乎无法前进。

2. 进展，进步，成功
   She has made remarkable headway in her writing skills.

   她在写作技巧方面有了长足进步。

3. 【美】（前后两班车，船，飞机的）间隔时间；间隔距离

n.

1. forward movement or progress.
2. the average interval between trains or buses on a regular service.