'reconciler' originates from Latin, specifically the word 'reconciliare,' where 're-' meant 'again' and 'conciliare' meant 'to make friendly.'

'reconciliare' changed from Old French word 'reconcilier' and eventually became the modern English word 'reconcile,' from which 'reconciler' is derived by adding the agent suffix '-er.'

Initially, it meant 'one who restores friendly relations,' and this meaning has remained consistent in modern usage as 'a person who brings others into agreement.'