Definition of prep noun from the Oxford Advanced Learner's Dictionary

 

prep

 noun
noun
BrE BrE//prep//
 
; NAmE NAmE//prep//
 
 
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[uncountable] (British English) (in some private schools) school work that is done at the end of the day after lessons Word Originnoun mid 19th cent.: abbreviation of preparation.
See the Oxford Advanced American Dictionary entry: prep