[room-meyt, room-]
a person who is assigned to share or shares a room or apartment with another or others.

1780–90, Americanism; room + mate1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
roommate (ˈruːmˌmeɪt, ˈrʊm-)
a person with whom one shares a room or lodging

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
My overuse of apologies once caused my roommate to unintentionally fling me on
  the floor of a restaurant.
He called me in the middle of the night rambling about his roommate stalking
  and wanting to harm him.
Everything seemed fine until he lunged at both the vet and her roommate.
He was playing video games in the morning, according to a roommate.
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