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Era |
 | | A calendar era span of many years which are numbered beginning at a specific epoch, which often marks the origin of a state or cosmology, the birth of a leader, or another significant historical or mythological event; it can be called after either accordingly. |
 | | The word era also denotes the units used under a different, more arbitrary system where time is not represented as an endless continuum with a single reference year, but each unit starts counting from one again, as if time starts again. |
 | | In common speech and various contexts, the term era is also used, by extension, for any (as a rule relatively long) period in history with a name, often relating to common characteristic(s), even if this is not the normal way to organize time. |
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