'Roommate' definitions:

Definition of 'roommate'

From: WordNet
noun
An associate who shares a room with you [syn: roommate, roomie, roomy]

Definition of 'Roommate'

From: GCIDE
  • Roommate \Room"mate`\, n. One of two or more occupying the same room or rooms; one who shares the occupancy of a room or rooms; a chum. [1913 Webster]

Synonyms of 'roommate'

From: Moby Thesaurus