'remission' originates from Latin, specifically the word 'remissio,' where 're-' meant 'back' and 'mittere' meant 'to send.'

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

Initially, it meant 'sending back or letting go,' but over time it evolved into its current meanings of 'decrease in disease symptoms' and 'cancellation of a debt or penalty.'