New Year's Eve
US /ˌnuː jɪrz ˈiːv/
UK /ˌnuː jɪrz ˈiːv/

1.
notte di Capodanno, San Silvestro
the last day of the year, December 31, which is celebrated with parties and other festivities leading up to midnight and the start of the new year
:
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We're planning a big party for New Year's Eve.
Stiamo organizzando una grande festa per la notte di Capodanno.
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Many people watch fireworks on New Year's Eve.
Molte persone guardano i fuochi d'artificio la notte di Capodanno.