'immune' originates from Latin, specifically the word 'immunis,' where 'in-' meant 'not' and 'munis' meant 'ready for service.'

'immunis' transformed into the Old French word 'immun,' and eventually became the modern English word 'immune' through Middle English.

Initially, it meant 'exempt from public service or duty,' but over time it evolved into its current meaning of 'resistant to disease or influence.'