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definition : timespan. An era is a span of time defined for the purposes of chronology or historiography, as in the regnal eras in the history of a given monarchy, a calendar era used for a given calendar, or the geological eras defined for the history of Earth.What is a time span?
Meaning of “time span” in the English Dictionary. "time span" in English. › a period of time within which something happens, or between two events: The attacks all happened less than 5 miles apart within a three-week time span. Our minds can't imagine a timespan as long as a million years.