PRAEPOSTOR Meaning of PRAEPOSTOR in English [ prɪ'pɒstə ](also prepostor ) ■ noun Brit. (at some public schools) a prefect or monitor.OriginC18: from praepositor , alt. of L. praepositus 'head, chief'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004