Definition of headways:
(n) :
Movement ahead or forward.
(n) :
(uncountable, figuratively) Progress toward a goal.
(n) :
(countable, transport) The interval of time or distance between the fronts of two vehicles (e.g. buses) moving in succession in the same direction, especially along the same pre-determined route.
(n) :
(nautical) Forward motion, or its rate.
(n) :
(countable) The clearance beneath an object, such as an arch, ceiling or bridge; headroom.
(n) :
(mining) A crossheading.