headway

Plural: headways

Noun

• vertical space available to allow easy passage under something
• forward movement
  • "the ship made little headway against the gale"
• Movement ahead or forward.
• Forward motion, or its rate.
• 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.
• Progress toward a goal.
• The clearance beneath an object, such as an arch, ceiling or bridge; headroom.
• A crossheading.
• pl. -WAYS forward movement

Synonyms

clearance, head, headroom

Related Words

seaway