Roommate/ˈruːmmeɪt/ Definition 1 of 1Pro Tip 1/3Shared Responsibility Roommate often implies sharing responsibilities such as rent and chores. My roommate and I take turns cleaning the living room. Pro Tip 2/3Close Quarters Having a roommate means living in close proximity, which can affect privacy. Can we chat later? My roommate is sleeping right now. Pro Tip 3/3Temporary Arrangement The term roommate often refers to a temporary living situation, especially in college. I'll need a new roommate once Sarah graduates.