A dining group is a gathering of people who come together to share a meal. The term 'dining group' can refer to a variety of different types of gatherings, from a formal dinner PARTY to a casual get-together. In this crossword, the solution for the term 'dining group' is 'PARTY, ' which is an informal type of dining group. A PARTY usually involves food and drinks, and is often held in someone's home or at a restaurant.