[room, room]
a portion of space within a building or other structure, separated by walls or partitions from other parts: a dining room.
rooms, lodgings or quarters, as in a house or building.
the persons present in a room: The whole room laughed.
space or extent of space occupied by or available for something: The desk takes up too much room.
opportunity or scope for something: room for improvement; room for doubt.
status or a station in life considered as a place: He fought for room at the top.
capacity: Her brain had no room for trivia.
Mining. a working area cut between pillars.
verb (used without object)
to occupy a room or rooms; lodge.

before 900; Middle English roum(e), Old English rūm; cognate with Dutch ruim, German Raum

underroom, noun

5. provision, margin, allowance.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
room (ruːm, rʊm)
1.  space or extent, esp unoccupied or unobstructed space for a particular purpose: is there room to pass?
2.  an area within a building enclosed by a floor, a ceiling, and walls or partitions: sitting room; dining room
3.  (functioning as singular or plural) the people present in a room: the whole room was laughing
4.  (foll by for) opportunity or scope: room for manoeuvre
5.  (plural) a part of a house, hotel, etc, that is rented out as separate accommodation; lodgings: she got rooms in town
6.  a euphemistic word for lavatory
7.  chiefly (US) (intr) to occupy or share a room or lodging: where does he room?
[Old English rūm; related to Gothic, Old High German rūm]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

O.E. rum "space," from P.Gmc. *ruman (cf. O.N., O.S., O.H.G., Goth. rum, Ger. Raum "space," Du. ruim "hold of a ship, nave"), nouns formed from Gmc. adj. *ruma- "roomy, spacious," perhaps from a PIE base *rew- "wide, open" (cf. Avestan ravah- "space," L. rus "open country," O.Ir. roi, roe "plain field").
Original sense preserved in make room "clear space for oneself" (1375); meaning "chamber, cabin" first recorded 1312 as a nautical term, and first applied 1457 to chambers within houses. The O.E. word for this was cofa, ancestor of cove. The verb meaning "to occupy rooms" (especially with another) as a lodger" is first recorded 1828. Room-service is attested from 1930; room-temperature from 1924. Adj. roomy is attested from 1627. Roommate is first attested 1789, Amer.Eng. (short form roomie is from 1918). Roomth "sufficient space" (1540) now is obsolete.
Online Etymology Dictionary, © 2010 Douglas Harper
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