Farewell. / Goodbye (final).
'Addio' — ad-DIO. Stress on the second syllable. The 'io' is a diphthong. A weighty word — don't use it casually.
Use only for final, permanent, or very long goodbyes — emigrating, ending a relationship permanently, or at a funeral. Using 'addio' casually when you'll see someone next week would seem dramatic or strange.
'Addio' comes from 'a Dio' (to God) — entrusting the departing person to God's care. It implies finality — this may be the last meeting. It's the Italian equivalent of 'farewell' rather than 'goodbye'. Its weight makes it poetic but not everyday.
Ti auguro tutto il bene del mondo.
I wish you all the good in the world.
Generous final wish — all the goodness in the world. Used for very long or final separations.
Porta un bel ricordo di noi.
Take a lovely memory of us.
Bittersweet — asks them to carry the memory of your time together
Che tu possa essere felice.
May you be happy.
Subjunctive wish — 'che tu possa' (may you be able to). Very formal, almost poetic.
Italian emigration has a long history — from mass emigration to the Americas in the early 20th century to contemporary brain drain ('fuga dei cervelli'). 'Addio' has a painful resonance in Italian culture, tied to the experience of families torn apart by emigration. Opera arias and folk songs immortalise it.