headway: Meaning and Definition of

head•way

1. forward movement; progress in a forward direction: The ship's headway was slowed by the storm.
2. progress in general: headway in a career.
3. rate of progress: a slight headway against concerted opposition.
4. the time interval or distance between two vehicles, as automobiles, ships, or railroad or subway cars, traveling in the same direction over the same route.
5. to proceed forward; advance; progress.

head•way

1. headroom (def. 2).