headroom

Plural: headrooms

Noun

• The clear vertical space available; clearance overhead.
• 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”).

Examples

• There wasn’t much HEADROOM left on the board for a long word, so he opted for a short one.

Synonyms

clearance, dynamic headroom, headway, headspace