From Longman Dictionary of Contemporary Englishflatmateflat‧mate /ˈflætmeɪt/ noun [countable] British English LIVE WITH somebodysomeone who shares a flat with one or more other people SYN roommate American English
Examples from the Corpus
flatmate• But a few years ago, there's no way Ray and his leggy friends would have been flatmates.• That was the story I had later from one of her flatmates.• They were investigating alleged deception by his flatmate, which he says he had nothing to do with.• This is Roaslind, my flatmate.• My flatmate moved out a month ago, and in that month I've used it as an excuse to binge.• You can't have a party without asking your flatmate first.• I hope you've told your flatmate about me? 