definition of the word headway

From head + way.

headway (countable and uncountable; plural headways)

1. (nautical) Forward motion, or its rate.
2. (countable, transport) The interval of time or distance between two vehicles (e.g. buses) moving in the same direction, especially along the same pre-determined route.
3. (uncountable, slang) Progress toward a goal.
4. (countable) The clearance beneath an arch, ceiling or bridge; headroom.

• make headway

• seaway

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