flatmates

Noun

flatmate (plural flatmates)

1. A person with whom one shares a flat.
   • Yet when both Regine and her flatmate are at home they tend to spend their time in their rooms, although Regine (and probably the flatmate too) tends to spend more time in the communal areas of the flat when the other is not at home.2002, Elaine Lally, At Home with Computers, page 149
2. (Ireland, New Zealand, UK) A person with whom one shares any rental dwelling, not necessarily a flat.
   • It had been weeks since all the flatmates had sat down together for a meal. Communication was breaking down. Written notes had begun to appear all over the house; please don′t touch this food, I bought it especially for Hermione[…].1993, Beryl Fletcher, The Iron Mouth, page 190