'reconfirm' originates from Latin, specifically the word 'reconfirmare,' where 're-' meant 'again' and 'confirmare' meant 'to establish firmly.'

'reconfirmare' transformed into the French word 'reconfirmer,' and eventually became the modern English word 'reconfirm' through Middle English.

Initially, it meant 'to establish firmly again,' and this meaning has largely remained the same in modern usage.