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

'adjectio' transformed into the French word 'adjection,' and eventually became the modern English word 'adjection' through Middle English.

Initially, it meant 'the act of adding,' and this meaning has largely remained the same in modern usage.