Over many generations; continuing across successive generations.
その家は世々農業を営んできた。
That family has practiced farming for generations.
この寺の祭りは世々伝わる行事だ。
The temple festival is an event handed down through many generations.
世々の恨みを晴らすという話は昔話に多い。
Stories about avenging grievances across generations are common in old tales.