headroom

[hed-room, -room]
noun
1.
Nautical. the clear space between two decks.
2.
Also called headway.
a.
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.
b.
clear vertical space above one’s head, as in a vehicle or room: plenty of headroom for passengers.
3.
Also, head room.


Origin:
1850–55; head + room

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
headroom or headway (ˈhɛdˌrʊm, -ˌruːm)
 
n
the height of a bridge, room, etc; clearance
 
headway or headway
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The expanded attic provides ample headroom for a new sitting area.
The raising of new capital leaves some headroom for further markdowns.
But it also means that there is more headroom for expansionary policy, and more
  need.
Not only does it have more than enough headroom, the vestibule is covered and
  there is a terrific rain cover.
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