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headroom

The definition of headroom is the space between your head and something over your head such as a doorway or the top of a vehicle, or the space between a vehicle and bridges or other structures that may be over that vehicle.

(noun)

The space you have been your head and the car's roof is an example of headroom.

See headroom in Webster's New World College Dictionary

noun

space or clearance overhead, as in a doorway, tunnel, etc.
the temporary increase in volume or power that a high-fidelity audio component can accommodate without distortion

See headroom in American Heritage Dictionary 4

noun