IPA: //ˌpriːˈpɜːr.tʃəs//
KK: /priˈpɜrʧəs/
Relating to something that occurs before a purchase is made.
The prepurchase inspection helped the buyer make an informed decision.
Prepurchase → It is formed from "pre-" (meaning before) and "purchase" (from Old French *pourchacier*, meaning to seek or obtain). The word "prepurchase" means to obtain something before it is officially available or before a certain time.
Think of doing something 'before' ('pre-') you 'obtain' ('purchase') it — that's why prepurchase means to buy something ahead of time.