headroom

(hĕd'rūm', -rʊm')
n.

1. Space above one's head, as in a motor vehicle, above a doorway, or in a tunnel; clearance.
2. Electronics. Dynamic headroom.

Minimum heights for standing and sitting below deck
It’s unfortunate, from a yacht designer’s point of view, that humans are vertically oriented, whereas boats are horizontally oriented. If we were designed to carry ourselves more like the snake or the centipede, we would fit much more conveniently into the long, low shape of an efficient boat.It’s not until a boat approaches 27 feet (8.2 m) in length that it becomes possible to offer full standing headroom below without spoiling her looks and efficiency with a large and ugly deckhouse.The generally accepted definition of full standing headroom is 6 feet, 1 inch (1.85 m) clear beneath the deck beams or headliner. Clear sitting headroom on small boats is usually understood to be between 4 feet, 0 inch (1.22 m) and 4 feet, 9 inches (1.45 m). Anything more, but lacking full standing headroom, is an irritant because it constantly invites you to stand and hit your head.Standing headroom is not an important component of seaworthiness or sailing ability; rather, it’s the opposite. In any case, on an ocean passage, most of your time down below is spent sitting or lying down. Scores of small boats without standing headroom have crossed oceans, and many have even circumnavigated. As the British yacht designer, Uffa Fox, pointed out, if you want standing headroom, there’s plenty on deck.

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Note: click on a word meaning below to see its connections and related words.

The noun has 2 meanings:

Meaning #1: vertical space available to allow easy passage under something
  Synonyms: headway, clearance

Meaning #2: the capacity of a system to reproduce loud sounds without distortion
  Synonym: dynamic headroom

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Dansk (Danish)
n. - fri højde, loftshøjde

Nederlands (Dutch)
doorrijhoogte, hoofdruimte, hoofdzaal

Français (French)
n. - hauteur (du plafond), (Transp) hauteur

Deutsch (German)
n. - (lichte) Höhe, Kopfraum

Ελληνική (Greek)
n. - ελεύθερο ύψος (γέφυρας κ.λπ.)

Italiano (Italian)
spazio (sotto un tetto, un ponte ecc...)

Português (Portuguese)
n. - pé-direito (m) (Arquit.)

Русский (Russian)
габаритная высота, просвет арки, высота туннеля

Español (Spanish)
n. - altura libre debajo de un techo o puente

Svenska (Swedish)
n. - fri höjd (trafik)

中文（简体）(Chinese (Simplified))
净空, 净空高度, 头上空间

中文（繁體）(Chinese (Traditional))
n. - 淨空, 淨空高度, 頭上空間

한국어 (Korean)
n. - 머리와 천장과의 공간

日本語 (Japanese)
n. - 頭上スペース

العربيه (Arabic)
‏(الاسم) فسحه مفتوحه فوق رأس, الشخص مثلا في باب أو سيارة أو فوق شاحنه أو قاطرة مثلا عندما, تمر تحت جسر‏

עברית (Hebrew)
n. - ‮מרווח-גובה, המרווח בין גג הרכב לגשר שמעליו‬

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little headroom	headroom desktop amp