A feast is a huge, delicious meal that's served at a party or celebration. You might have a feast to celebrate the last day of school every year.
You can use the word feast in several different ways. It's good for describing the meal you eat at a party, or as a verb meaning "to eat in celebration." You might feast for several days during your family reunion. You can also use feast figuratively to mean a delight, as when you say, "Your garden is a feast for the eyes, Grandma." The Latin root, festa, means "holidays or feasts," from festus, "festive, joyful, or merry."