room (n.)

Old English rum "space" (extent or time); "scope, opportunity," from Proto-Germanic *ruman (source also of Old Norse, Old Saxon, Old High German, Gothic rum, German Raum "space," Dutch ruim "hold of a ship, nave"), nouns formed from Germanic adjective *ruma- "roomy, spacious," from PIE root *reue- (1) "to open; space" (source also of Avestan ravah- "space," Latin rus "open country," Old Irish roi, roe "plain field," Old Church Slavonic ravinu "level," Russian ravnina "a plain"). Old English also had a frequent adjective rum "roomy, wide, long, spacious."

Original sense preserved in make room "clear space for oneself" (late 14c.); meaning "chamber, cabin" first recorded early 14c. as a nautical term, and first applied mid-15c. to chambers within houses. The Old English word for this was cofa, ancestor of cove. Room-service is attested from 1913; room-temperature from 1879. Roomth "sufficient space" (1530s, with -th (2)) now is obsolete.

room (v.)

"to occupy rooms" (especially with another) as a lodger," 1828, from room (n.). Related: Roomed; rooming. Rooming-house is from 1889. In Old English (rumian) and Middle English the verb meant "become clear of obstacles; make clear of, evict."

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Definitions of room from WordNet
room (n.)
an area within a building enclosed by walls and floor and ceiling;
the rooms were very small but they had a nice view
room (n.)
space for movement;
hardly enough elbow room to turn around
room to pass
Synonyms: way / elbow room
room (n.)
opportunity for;
room for improvement
room (n.)
the people who are present in a room;
the whole room was cheering
room (v.)
live and take one's meals at or in;
she rooms in an old boarding house
Synonyms: board