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.
Also, head room.
Origin
1850–55; head + room
British Dictionary definitions for head room
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
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