'append' originates from Latin, specifically the word 'appendere', where 'ad-' meant 'to, toward' and 'pendere' meant 'to hang'.

'append' changed from the Late Latin/Medieval Latin word 'appendere' and Middle English forms such as 'apenden' and eventually became the modern English word 'append'.

Initially it meant 'to hang on' or 'to attach by hanging', but over time it evolved into its current meaning of 'to add or attach (something), especially at the end'.