'pre-purchase' originates from the prefix 'pre-' meaning 'before' and the word 'purchase' from Old French 'purchacier', meaning 'to acquire'.

'purchacier' transformed into the Middle English word 'purchase', and eventually became the modern English word 'purchase'.

Initially, it meant 'to acquire something', and over time it evolved to include the concept of acquiring in advance with 'pre-'.