MezzogiornoPronunciation: /ˌmɛtsəʊˈdʒɔːnəʊ, meddzoˈdʒorno/Definition of Mezzogiorno the southern part of Italy, including Sicily and Sardinia. Origin:Italian, literally 'midday'; compare with MidiMezzogiorno in other Oxford dictionaries Definition of Mezzogiorno in the US English dictionary