'repayment' originates from the prefix 're-' meaning 'again' and the word 'payment' from Old French 'paiment', which meant 'payment'.

'paiment' transformed into the Middle English word 'payment', and eventually became the modern English word 'repayment' with the addition of the prefix 're-'.

Initially, it meant 'to pay again', but over time it evolved into its current meaning of 'the action of paying back a loan or debt'.