HEADROOM
headroom, dynamic headroom
(noun) the capacity of a system to reproduce loud sounds without distortion
headroom, headway, clearance
(noun) vertical space available to allow easy passage under something
Source: WordNet® 3.1
Etymology
Noun
headroom (countable and uncountable, plural headrooms)
The vertical clearance above someone's head, as in a tunnel, doorway etc.
The vertical measurement, top to bottom, for example for clearance under a bridge.
(electronics) 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.
Anagrams
• Moorhead
Source: Wiktionary
Head"room`, n. (Arch.)
Definition: See Headway, 2.
Source: Webster’s Unabridged Dictionary 1913 Edition