'atoneable' originates from English, specifically from the adjective-forming combination of the verb 'atone' and the suffix '-able', where 'atone' meant 'to be at one (in harmony)' and '-able' meant 'capable of or susceptible of'.

'atone' developed in Early Modern English from the phrase 'at one' (Middle English 'at onen'), and the productive suffix '-able' comes via Old French and Latin ('-abilis'). These elements combined in Modern English to form adjectives such as 'atonable' and less commonly 'atoneable'.

Initially, 'atone' carried the sense 'to be at one; to reconcile' and over time evolved to mean 'to make amends for an offense'; 'atoneable' thus came to mean 'able to be made amends for'.