Era
Span of time defined for the purposes of chronology or historiography / From Wikipedia, the free encyclopedia
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For other uses, see Era (disambiguation).
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.[1]
Look up era in Wiktionary, the free dictionary.
Comparable terms are epoch, age, period, saeculum, aeon (Greek aion)[2] and Sanskrit yuga.[3]