'adjectional' originates from Latin, specifically the word 'adjectio,' where 'ad-' meant 'toward' and 'jectio' meant 'throwing or adding.'

'adjectio' transformed into the English word 'adjection,' and eventually became the modern English word 'adjectional.'

Initially, it meant 'the act of adding,' but over time it evolved into its current meaning of 'relating to addition.'