This great post from the "French word a day" blog introduced me to the word déjouper, a meal that stretches from lunch time to dinner time and cover lunch and dinner. (Kind of the same as the made-up English word lupper that we used to use when I was growing up).
Usually lupper was what you had when you forgot to eat lunch at the usual time, got really hungry in the afternoon, and had an early dinner. Déjouper on the other hand seems to be more of an informal dinner party with friends and family that starts around 1:30pm and stretches on into the early evening. It sounds very civilized, and like something I need to do more often!