'presumptive' originates from Latin, specifically the word 'praesumptivus,' where 'prae-' meant 'before' and 'sumere' meant 'to take.'

'praesumptivus' transformed into the Old French word 'presumptif,' and eventually became the modern English word 'presumptive.'

Initially, it meant 'taken beforehand,' but over time it evolved into its current meaning of 'assumed to be true until proven otherwise.'