世The world. Also refers to 30 years. During a person's life. A lifetime. The period of time before a person inherits a position from his parents and passes it on to his children. To pass on from generation to generation. A period of time. The world. Society.
季A time period. A certain period of time. The time of each of the four seasons. The end of a season. The end of an era. The youngest of the brothers. The youngest child. Young.