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headroom (n.)

"space above the head," 1851, from head (n.) + room (n.).

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Definitions of headroom from WordNet

headroom (n.)
vertical space available to allow easy passage under something;
Synonyms: headway / clearance
headroom (n.)
the capacity of a system to reproduce loud sounds without distortion;
Synonyms: dynamic headroom
From wordnet.princeton.edu