Word Origin & History
roomO.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 Roomth "sufficient space" (1540) now is obsolete.