Definition of "roommate"

roommate

/ˈɹu(m)ˌmeɪt/

noun
plural roommates
1. A person with whom one shares a room, as at university, etc.
2. (US, Australia, Canada) A person sharing the same home (but generally not a family member or spouse).
  Quotations
  Audio (US)(file)
  2016, “Learning English (public domain)”, in (Please provide the book title or journal name)‎, archived from the original on 18 September 2017:I live with Marsha. We’re roommates.
3. (LGBT slang, humorous, ironic) A same-sex significant other with whom one lives; a coinhabitant in a non-heterosexual relationship.