a feast: a celebration centered on food and especially drinking, held to mark a joyful occasion
This is the word for a party, the big social meal that the Old Testament throws to mark a turning point: a child weaned, a wedding, a treaty sealed, a king's coronation. It is built from the verb for drinking, and that is the heart of it. A feast here is not just dinner; it is the wine flowing, the music, the long table, the guests staying late. The same word covers a quiet household gathering and a months-long royal celebration.
Most of the time it is purely festive and good. But because feasting is the picture of abundance and good fortune, the word also becomes a way of talking about the carefree, well-off life: the cheerful heart that lives as if every day were a banquet. And that same image turns dark in the prophets, who use the doomed feast (people drinking while ignoring God, or an enemy lulled with one final banquet) as a symbol of judgment about to fall.
The sense ranges from the event itself to what the event stands for, but a single core holds it together: an occasion of eating and drinking together, set apart from ordinary days.