saeculum

A cyclical period of time, roughly equal to the time needed for the complete renewal of a human population:

According to legend, the gods had allotted a certain number of saecula to every people or civilization; the Etruscans, for example, had been given ten saecula.

A cyclical period of time, roughly equal to the time needed for the complete renewal of a human population:

At the time of the reign of emperor Augustus, the Romans decided that a saeculum was 110 years.

Because new ages are retrodictive as well as prospective, Augustus had his hierarchs discover (post hoc) that his were the fifth Secular Games since the founding of Rome, and that a saeculum was historically a period of 110 years.

An approximately 85-year cycle in Strauss-Howe generational theory, a highly controversial sociological theory that postulates that zeitgeist and popular cultural values exist along recurring cycles.

Despite skepticism regarding the degree of forecasting, the authors' presentation of historical events is comprehensive and arguments for their organization into a cyclical method of four era saeculums convincing.