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Noun: headway  'hed,wey
  1. Forward movement
    "the ship made little headway against the gale";
    - head
     
  2. Vertical space available to allow easy passage under something
    "The low headway in the basement made it difficult to stand upright";
    - headroom, clearance

Derived forms: headways

Type of: advance, elbow room, progress, progression, room, way

Encyclopedia: Headway