| 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. | make headway, to proceed forward; advance; progress. |
m]
| 1. | Nautical. the clear space between two decks. |
| 2. | Also called headway. clear vertical space, as between the head and sill of a doorway or between the ceiling and floor of an attic room at a certain point, esp. such height as to allow passage or comfortable occupancy. |
| 3. | Audio. dynamic headroom. |