prep1Pronunciation: /prɛp/Translate prep | into Italian Definition of prep noun informal 1 [mass noun] British (in an independent school) schoolwork that is set to be done outside normal school hours. (especially in a boarding school) a period set aside for doing homework or preparing for lessons. 2 [as modifier] relating to education in a prep school:sixth-formers and prep pupils 3North American a student in a prep school. Origin: mid 19th century: abbreviation of preparationprep in other Oxford dictionaries Definition of prep in the US English dictionary