'adpromission' originates from Latin, specifically the word 'adpromissio', where 'ad-' meant 'toward' and 'promissio' meant 'promise'.

'adpromissio' transformed into the medieval Latin word 'adpromission', and eventually became the modern English word 'adpromission'.

Initially, it meant 'a promise to support or fulfill', but over time it evolved into its current meaning of 'a third-party promise to fulfill an obligation'.