A dynasty is a series of leaders in the same family, like the British Royal Family, or a local business dynasty, in which four generations have made their fortune at the family store.
The word dynasty, pronounced "DIE-nas-tee," comes from the Greek word dynasteia, meaning "power, lordship, sovereignty." If you are part of a dynasty, you probably do have power — and also wealth, privilege. But there is also pressure to achieve as much as your parents, grandparents, and other relatives. Another kind of dynasty is found in sports — a team that wins many championships is a dynasty.