Capodanno: capo ‘head’ d’anno ‘of the year’, so ‘the first day of the new year’, basically January 1st.
The ancient feast of Janus, from which January, god of beginnings and transitions, and the god of gates, doors, passages, endings and time. Juanuary, ianuarius, was named after him, and because it opens the door ianua of the new year.
Normally you celebrate Capodanno… sleeping till 2pm because you celebrated till 5am the night before.
And maybe having a good bowl of tortellini in brodo.