Pronunciation enPR: nŭn, IPA (key): /nʌn/ Audio (AU)(file) Homophone: none Noun Singular nun Plural nuns (countable) A nun is a member of a religious community of women who live under vows and usually wear a habit. Synonym: sister Antonyms: brother and monk Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads