Headroom meaning

hĕd'ro͝om', -ro͝om'
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.

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

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Space above one's head, as in a motor vehicle, above a doorway, or in a tunnel; clearance.
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Space or clearance overhead, as in a doorway or tunnel or above the seats of an automobile.
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The temporary increase in volume or power that a high-fidelity audio component can accommodate without distortion.
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Attenuation-to-crosstalk ratio (ACR). See ACR.
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The vertical clearance above someone's head, as in a tunnel, doorway etc.
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(electronics) The ability of a system to reproduce loud sounds free of distortion; dynamic headroom.
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The distance between the actual performance of an algorithm to its maximum possible performance.
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