D defs.my
Entry 1 sense Webster, 1913

Roommate

/ro͞om'-ātˌ/ · Room·mate · IPA /ˈɹu(m)ˌmeɪt/
01 n. One of two or more occupying the same room or rooms; one who shares the occupancy of a room or rooms; a chum.
  1. 1.
    One of two or more occupying the same room or rooms; one who shares the occupancy of a room or rooms; a chum.