'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 'one who seeks to improve or change something.'