'immunity' originates from Latin, specifically the word 'immunitas', where 'im-' meant 'not' and 'munus' meant 'duty or service'.

'immunitas' transformed into the Old French word 'immunité', and eventually became the modern English word 'immunity'.

Initially, it meant 'exemption from public service', but over time it evolved into its current meanings of 'exemption from legal duties' and 'resistance to disease'.