Prep
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1920s: abbreviation of prepare or preparation.
etymonline
prep (n.)
1862, short for preparation. Prep school is attested from 1895, short for preparatoryschool. First record of prep in the college slang sense "student or graduate of a preparatory school, student taking a preparatory course of study" is by 1899 (also see preppie).
prep (v.)
slang shortening of prepare, 1908. Related: Prepped; prepping.
