'adjectitious' originates from Latin, specifically the word 'adjecticius,' where 'ad-' meant 'to' and 'jacere' meant 'to throw.'

'adjecticius' transformed into the Medieval Latin word 'adjectitius,' and eventually became the modern English word 'adjectitious.'

Initially, it meant 'added or thrown to,' but over time it evolved into its current meaning of 'added or derived from something external.'