'reroute' originates from the prefix 're-' meaning 'again' and the word 'route' from Old French 'rute', meaning 'road'.

'rute' transformed into the English word 'route', and eventually became the modern English word 'reroute' with the addition of the prefix 're-'.

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