'purchaser' originates from Old French, specifically the word 'purchacier,' where 'pour-' meant 'for' and 'chacier' meant 'to chase.'

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

Initially, it meant 'to chase for something,' but over time it evolved into its current meaning of 'to buy or acquire something.'