'atoned' originates from English, specifically the phrase 'at one', where 'at' meant 'in the state of' or 'to' and 'one' meant 'being one / in agreement'.

'atoned' (from the verb 'atone') changed from the Middle English phrase 'at one' (meaning 'in agreement, reconciled') and eventually became the modern English verb 'atone' and its inflected forms like 'atoned'.

Initially it meant 'to be at one; to be in agreement,' but over time it evolved to the modern sense 'to make amends or reparation' (to restore agreement by compensating or reconciling).