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headroom

[hed-room, -roo m] /ˈhɛdˌrum, -ˌrʊm/
noun
1.
Nautical. the clear space between two decks.
2.
Also called headway.
  1. clear vertical space, as between the head and sill of a doorway, the ceiling and floor of a room, or the ceiling of a vehicular passageway and a vehicle roof, as to allow passage or comfortable occupancy: over 7.5 feet of headroom in the attic;
    a covered bridge with limited headroom.
  2. clear vertical space above one’s head, as in a vehicle or room:
    plenty of headroom for passengers.
3.
Origin of headroom
1850-1855
1850-55; head + room
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for headroom

headroom

/ˈhɛdˌrʊm; -ˌruːm/
noun
1.
the height of a bridge, room, etc; clearance
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for headroom
n.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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14
14
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