n.[U]

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

   航船在暴風驟雨中幾乎無法前進。

2. 進展，進步，成功
   She has made remarkable headway in her writing skills.

   她在寫作技巧方面有了長足進步。

3. 【美】（前後兩班車，船，飛機的）間隔時間；間隔距離

n.

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