'immunology' originates from Latin, specifically the word 'immunitas,' where 'immunis' meant 'exempt from public service or charge.'

'immunitas' transformed into the French word 'immunité,' and eventually became the modern English word 'immunity,' which led to the formation of 'immunology.'

Initially, it meant 'exemption from public service,' but over time it evolved into its current meaning of 'study of the immune system.'