Cohabitant
The Century Dictionary and Cyclopedia
noun.
One who dwells with another or in the same place.
the GNU version of the Collaborative International Dictionary of English
noun.
One who dwells with another, or in the same place or country.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
A person who
cohabits
with another
Word Usage
"Lohan, 50, was booked Monday night in West Hollywood, Calif., for inflicting corporal injury on a cohabitant, false imprisonment and preventing a report of victimization."