the GNU version of the Collaborative International Dictionary of English
n. One who dwells in the same house with another.
The Century Dictionary and Cyclopedia
n. One who lives in the same house with another; a household companion.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. someone who resides in the same house with you
Word Usage
"I went to many evenings in houses where the students living there would choose their new housemate from the candidates, I remember I once even went to three of those gatherings in one evening."