Plural of era; long periods of time in history marked by particular features, events, or characteristics.
From Late Latin 'aera' meaning 'number' or 'count,' ultimately from Latin 'aes' (bronze or money), since eras were often named by counting years or coins from significant events.
When we talk about eras like 'the Victorian Era' or 'the Ice Age,' we're really imposing human meaning on continuous time—historians and scientists debate fiercely where one era ends and another begins.
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