headway

Reading level: hard

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun vertical space available to allow easy passage under something
  2. noun forward movement

Etymology

Partly from Middle English hauedwei, from Old English hēafodweġ (“head-road, main-road”); partly as a shortening of ahead-way, the source of the nautical sense. By surface analysis, head + way.

In classic literature

Synonyms

headroom, clearance

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