Return period is a term used in hydrology to denote the average time interval between two events of the same magnitude or severity. However, there are several synonyms that can be used in place of return period, such as recurrence interval, repeat interval, and frequency. These terms are often used interchangeably in the field of hydrology and engineering, depending on the context in which they are being used. The concept of a return period is important in assessing the probability of extreme weather events and helps us better understand the frequency and severity of natural disasters. Regardless of the term used, return period is a critical concept that helps us plan for and mitigate the impact of extreme weather events.