Pronunciation IPA (key): /ˈɪnmeɪt/ Audio (US)(file) Noun Singular inmate Plural inmates (countable) An inmate is a person who is confined to an institution such as a prison. Synonym: prisoner (countable) An inmate is a person who shares a residence, such as a hotel guest, or a student living on campus. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads