'attachment' originates from Old French, specifically the word 'atachier,' where 'a-' meant 'to' and 'tachier' meant 'fasten.'

'atachier' transformed into the Middle English word 'attachen,' and eventually became the modern English word 'attachment.'

Initially, it meant 'to fasten or affix something,' but over time it evolved into its current meanings of 'affection' and 'supplementary part.'