- forward motion
- progress or success in work, etc.
- ☆ the difference in time or distance between two trains, ships, etc. traveling in the same direction over the same course
See headway in American Heritage Dictionary 4
- Forward movement or the rate of forward movement, especially of a ship.
- Progress toward a goal.
- The clear vertical space beneath a ceiling or archway; clearance.
- The distance in time or space that separates two vehicles traveling the same route.
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