The French word for the New Year's Eve dinner or celebration is réveillon.
A réveillon is a long, festive meal or gathering associated with Christmas Eve or New Year's Eve. The word comes from the French verb réveiller, “to wake up,” reflecting the historical idea of staying awake late into the night for the celebration.
A New Year's réveillon may take place at home, in a restaurant, or at a formal event. Menus vary widely, but celebratory foods can include oysters, foie gras, seafood, champagne, and elaborate desserts. The meal is a social tradition, not one fixed national menu.
The same word is also used for Christmas Eve celebrations, so context matters. In French-speaking communities outside France, local customs and spellings can differ. Réveillon should not be confused with Bastille Day, a national holiday in July, or with the galette des rois, a pastry traditionally associated with Epiphany in January.