'addio' originates from Italian, specifically the word 'addio', where 'a-' meant 'to' and 'Dio' meant 'God'.

'addio' has remained largely unchanged from its Italian origins and is used in English to convey a sense of finality in farewells.

Initially, it meant 'to God', implying a farewell with divine protection, and this meaning has largely remained the same in modern usage.