The plural form of “millennium” is “millennia.” A millennium refers to a period of 1,000 years, and “millennia” is used when discussing multiple such periods, often in the context of historical timelines or significant long-term events.
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BCE (Before Common Era) is a secular term used to indicate years before the start of the Gregorian calendar, similar to BC (Before Christ). Both refer to the same time period, but BCE avoids religious connotations, making it a more ...