Headway
WordNet

noun


(1)   Forward movement
"The ship made little headway against the gale"
(2)   Vertical space available to allow easy passage under something
WiktionaryText

Noun



  1. Forward motion, or its rate.
  2. 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.
  3. Progress toward a goal.
  4. The clearance beneath an arch, ceiling or bridge; headroom.
 
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