roommate
n. US //ˈɹuˌmeɪt// UK //ɹˈuːmeɪt// room·mate
-
1 sharing a bedroom (n.) A2 Elementarya person who sleeps in the same room as you, like in a university dormitory.
a person with whom one shares a single sleeping room, common in institutional settings like university dormitories or military barracks.
ExampleMy roommate in the college dorm always stays up late studying with the desk lamp on.
ExampleLiving with a roommate in such a cramped dormitory requires a high degree of mutual respect and clear communication regarding personal boundaries.
From room + -mate.