periodize
/pəˈrɪəˌdaɪz/Definitions
1. verb
to divide or group events, periods, or phenomena into distinct periods or epochs for study or analysis
“Historians must periodize the events of the 20th century to understand the complex global developments.”
2. noun
the act or process of dividing or grouping events, periods, or phenomena into distinct periods or epochs
“The historian’s periodization of the ancient world provided a framework for understanding the rise of civilizations.”