ˈ ̷ ̷ˌ ̷ ̷ noun
1.
a. : motion or rate of motion in a forward direction (as of a ship)
b. : advance , progress
make headway in a profession
a life in which the claims of spirit and emotion will make some headway against the necessities of physical existence — Clive Bell
2. : clear space (as under an arch or girder) sufficient to allow of easy passing underneath : headroom
3. : the time interval between two vehicles traveling in the same direction on the same route