nun /nʌn/noun 4/nʊn/ noun 1forms 2 noun4 •a woman who gives her life to God and lives with others like her, apart from the world •A member of a similar female community in other confessions. •A kind of pigeon with the feathers on its head like the hood of a nun. •(slang, no longer used) A prostitute. nun /nʊn/ noun1 •The fourteenth letter of many Semitic alphabets or abjads (Phoenician, Aramaic, Hebrew, Syriac, Arabic and others). formsnuns · nūns