housemate

from WordNet (r) 3.0 (2006)
housemate
    n 1: someone who resides in the same house with you
    
from The Collaborative International Dictionary of English v.0.48
Housemate \House"mate`\, n.
   One who dwells in the same house with another. --R. Browning.
   [1913 Webster]
    

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