headroom

Plural: headrooms

Noun

• vertical space available to allow easy passage under something
• the capacity of a system to reproduce loud sounds without distortion
• The vertical clearance above someone's head, as in a tunnel, doorway etc; room (space) for one's head.
• The vertical measurement, top to bottom, for example for clearance under a bridge.
• The ability of a system to reproduce loud sounds free of distortion; dynamic headroom.
• The distance between the actual performance of an algorithm and its maximum possible performance.
• Synonym of headspace (“space between the top of the contents of a container and its seal”).
• pl. -S clear vertical space

Synonyms

clearance, dynamic headroom, headway, headspace