WordNet (r) 3.0 (2006):

prep
    n 1: preparatory school work done outside school (especially at
         home) [syn: homework, prep, preparation]

Moby Thesaurus II by Grady Ward, 1.0:

63 Moby Thesaurus words for "prep":
   arrange, arrangement, basic training, briefing, clear for action,
   clear the decks, clearing the decks, cure, deploy, dress,
   equipment, familiarization, fix, fix up, fixing, foundation,
   get ready, groundwork, make arrangements, make preparations,
   make ready, makeready, making ready, manufacture, marshal,
   mobilization, mobilize, plan, planning, prearrange, prearrangement,
   preliminaries, preliminary, preliminary act, preliminary step,
   preparation, preparatory study, prepare, preparing, prepping,
   prerequisite, pretreat, pretreatment, process, processing,
   propaedeutic, provide, provision, put in shape, ready, ready up,
   readying, settle preliminaries, spadework, tan, training, treat,
   treatment, trial, trim, try out, tryout, warm-up



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PREP
       PowerPC REferenz Plattform (IBM, Apple), "PReP"


The Free On-line Dictionary of Computing (30 December 2018):

PREP

   1. (PReP) PowerPC Reference Platform.

   2. (PREP) PRogrammed Electronics Patterns.  Language for
   designing integrated circuits.  ["Computer Assisted Mask
   Production", R.L. Rosenfeld, Proc IEEE 57(9) Sep 1969].