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Noun: headroom  'hed,room or 'hed,rûm
  1. Vertical space available to allow easy passage under something
    - headway, clearance
     
  2. The capacity of a system to reproduce loud sounds without distortion
    - dynamic headroom

Derived forms: headrooms

Type of: elbow room, hi-fi, high fidelity, room, way

Encyclopedia: Headroom