Oxford Dictionary English

    headroom

    noun
    noun
    BrE BrE//ˈhedruːm//
    ; NAmE NAmE//ˈhedruːm//
    ; BrE BrE//ˈhedrʊm//
    ; NAmE NAmE//ˈhedrʊm//
    [uncountable]
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  1. 1the amount of space between the top of a vehicle and an object it drives under The sign on the bridge said ‘Maximum Headroom 2.5 metres’.
  2. 2the amount of space between the top of your head and the roof of a vehicle There's a lot of headroom for such a small car. The new model gives generous headroom for front and rear passengers.
See headroom in the Oxford Advanced American Dictionary
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