'Reformer' originates from Latin, specifically the word 'reformare,' where 're-' meant 'again' and 'formare' meant 'to form.'

'Reformare' transformed into the Old French word 'reformer,' and eventually became the modern English word 'reformer' through Middle English.

Initially, it meant 'to form again,' but over time it evolved into its current meaning of 'a person who makes changes to improve something.'